what is a vertex presentation

• Third Trimester
• Labor & Delivery

What Is Vertex Presentation?

Vertex presentation is just medical speak for “baby’s head-down in the birth canal and rearing to go!” About 97 percent of all deliveries are headfirst, or vertex—and rare is the OB who will try to deliver any other way.

Other, less common presentations include breech (when baby’s head is near your ribs) and transverse (which means the shoulder, arm or trunk is due to come out first because baby is lying on his side). Most babies will turn by about 34 weeks, but some have “unstable lies,” meaning they’re like a politician trying to make everyone happy—that is, they frequently flip positions.

About 95 percent of all babies will be head-down and ready to go by delivery day. If your little one isn’t vertex by 36 weeks, ask your doctor about your options. She may recommend doing a version procedure , in which the doctor tries to manually turn baby by pushing on your abdomen, but it does carry some risks and is only about 60 to 70 percent successful.

Expert: Melissa M. Goist, MD, assistant professor, obstetrics and gynecology, The Ohio State University Medical Center.

Please note: The Bump and the materials and information it contains are not intended to, and do not constitute, medical or other health advice or diagnosis and should not be used as such. You should always consult with a qualified physician or health professional about your specific circumstances.

Plus, more from The Bump:

Delivering a breech baby?

Shift breech baby before birth?

Will my baby be breech?

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Fetal Presentation, Position, and Lie (Including Breech Presentation)

• Key Points |

Abnormal fetal lie or presentation may occur due to fetal size, fetal anomalies, uterine structural abnormalities, multiple gestation, or other factors. Diagnosis is by examination or ultrasonography. Management is with physical maneuvers to reposition the fetus, operative vaginal delivery , or cesarean delivery .

Terms that describe the fetus in relation to the uterus, cervix, and maternal pelvis are

Fetal presentation: Fetal part that overlies the maternal pelvic inlet; vertex (cephalic), face, brow, breech, shoulder, funic (umbilical cord), or compound (more than one part, eg, shoulder and hand)

Fetal position: Relation of the presenting part to an anatomic axis; for transverse presentation, occiput anterior, occiput posterior, occiput transverse

Fetal lie: Relation of the fetus to the long axis of the uterus; longitudinal, oblique, or transverse

Normal fetal lie is longitudinal, normal presentation is vertex, and occiput anterior is the most common position.

Abnormal fetal lie, presentation, or position may occur with

Fetopelvic disproportion (fetus too large for the pelvic inlet)

Fetal congenital anomalies

Uterine structural abnormalities (eg, fibroids, synechiae)

Multiple gestation

Several common types of abnormal lie or presentation are discussed here.

Transverse lie

Fetal position is transverse, with the fetal long axis oblique or perpendicular rather than parallel to the maternal long axis. Transverse lie is often accompanied by shoulder presentation, which requires cesarean delivery.

Breech presentation

There are several types of breech presentation.

Frank breech: The fetal hips are flexed, and the knees extended (pike position).

Complete breech: The fetus seems to be sitting with hips and knees flexed.

Single or double footling presentation: One or both legs are completely extended and present before the buttocks.

Types of breech presentations

Breech presentation makes delivery difficult ,primarily because the presenting part is a poor dilating wedge. Having a poor dilating wedge can lead to incomplete cervical dilation, because the presenting part is narrower than the head that follows. The head, which is the part with the largest diameter, can then be trapped during delivery.

Additionally, the trapped fetal head can compress the umbilical cord if the fetal umbilicus is visible at the introitus, particularly in primiparas whose pelvic tissues have not been dilated by previous deliveries. Umbilical cord compression may cause fetal hypoxemia.

Predisposing factors for breech presentation include

Preterm labor

Uterine abnormalities

Fetal anomalies

If delivery is vaginal, breech presentation may increase risk of

Umbilical cord prolapse

Birth trauma

Perinatal death

Face or brow presentation

In face presentation, the head is hyperextended, and position is designated by the position of the chin (mentum). When the chin is posterior, the head is less likely to rotate and less likely to deliver vaginally, necessitating cesarean delivery.

Brow presentation usually converts spontaneously to vertex or face presentation.

Occiput posterior position

The most common abnormal position is occiput posterior.

The fetal neck is usually somewhat deflexed; thus, a larger diameter of the head must pass through the pelvis.

Progress may arrest in the second phase of labor. Operative vaginal delivery or cesarean delivery is often required.

Position and Presentation of the Fetus

If a fetus is in the occiput posterior position, operative vaginal delivery or cesarean delivery is often required.

In breech presentation, the presenting part is a poor dilating wedge, which can cause the head to be trapped during delivery, often compressing the umbilical cord.

For breech presentation, usually do cesarean delivery at 39 weeks or during labor, but external cephalic version is sometimes successful before labor, usually at 37 or 38 weeks.

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Vertex Position: What It Is, Why It's Important, and How to Get There

Jamie Grill / Getty Images

What Is the Vertex Position?

• Why It's Important

When the Vertex Position Usually Occurs

• How to Get Baby in This Position

Options if Baby Is Not in the Vertex Position

While you are pregnant, you may hear your healthcare provider frequently refer to the position or presentation of your baby, particularly as you get closer to your due date . What they are referring to is which part of your baby is presenting first—or which part is at the lower end of your womb or the pelvic inlet.

Consequently, when they tell you that your baby's head is down, that likely means they are in the vertex position (or another cephalic position). This type of presentation is the most common presentation in the third trimester. Here is what you need to know about the vertex position including how you might get your baby into that position before you go into labor .

The vertex position is a medical term that means the fetus has its head down in the maternal pelvis and the occipital (back) portion of the fetal skull is in the lowest position or presenting, explains Jill Purdie, MD, an OB/GYN and medical director at Northside Women’s Specialists , which is part of Pediatrix Medical Group.

When a baby is in the vertex position, their head is in the down position in the pelvis in preparation for a vaginal birth, adds Shaghayegh DeNoble, MD, FACOG , a board-certified gynecologist and a fellowship-trained minimally invasive gynecologic surgeon. "More specifically, the fetus’s chin is tucked to the chest so that the back of the head is presenting first."

Why the Vertex Position Is Important

When it comes to labor and delivery, the vertex position is the ideal position for a vaginal delivery, especially if the baby is in the occiput anterior position—where the back of the baby's head is toward the front of the pregnant person's pelvis, says Dr. DeNoble.

"[This] is the best position for vaginal birth because it is associated with fewer Cesarean sections , faster births, and less painful births," she says. "In this position, the fetus’s skull fits the birth canal best. In the occiput posterior position, the back of the fetus's head is toward the [pregnant person's] spine. This position is usually associated with longer labor and sometimes more painful birth."

Other fetal positions are sometimes less-than-ideal for labor and delivery. According to Dr. DeNoble, they can cause more prolonged labor, fetal distress, and interventions such as vacuum or forceps delivery and Cesarean delivery.

"Another important fact is that positions other than vertex present an increased risk of cord prolapse, which is when the umbilical cord falls into the vaginal canal ahead of the baby," she says. "For example, if the fetus is in the transverse position and the [pregnant person's] water breaks , there is an increased risk of the umbilical cord prolapsing through the cervix into the vaginal canal."

When it comes to your baby's positioning, obstetricians will look to see what part of the fetus is in position to present during vaginal birth. If your baby’s head is down during labor, they will look to see if the back of the head is facing your front or your back as well as whether the back of the head is presenting or rather face or brow, Dr. DeNoble explains.

"These determinations are important during labor, especially if there is consideration to the use of a vacuum or forceps," she says.

According to Dr. Purdie, healthcare providers will begin assessing the position of the baby as early as 32 to 34 weeks of pregnancy. About 75% to 80% of fetuses will be in the vertex presentation by 30 weeks and 96% to 97% by 37 weeks. Approximately 3% to 4% of fetuses will be in a non-cephalic position at term, she adds.

Typically, your provider will perform what is called Leopold maneuvers to determine the position of the baby. "Leopold maneuvers involve the doctor placing their hands on the gravid abdomen in several locations to find the fetal head and buttocks," Dr. Purdie explains.

If your baby is not in the vertex position, the next most common position would be breech, she says. This means that your baby's legs or buttocks are presenting first and the head is up toward the rib cage.

"The fetus may also be transverse," Dr. Purdie says. "The transverse position means the fetus is sideways within the uterus and no part is presenting in the maternal pelvis. In other words, the head is either on the left or right side of the uterus and the fetus goes straight across to the opposite side."

There is even a chance that your baby will be in an oblique position. This means they are at a diagonal within the uterus, Dr. Purdie says. "In this position, either the head or the buttocks can be down, but they are not in the maternal pelvis and instead off to the left or right side."

If your baby's head is not down, your provider will look to see if the buttocks are in the pelvis or one or two feet, Dr. DeNoble adds. "If the baby is laying horizontally, then the doctor needs to know if the back of the baby is facing downwards or upwards since at a Cesarean delivery it can be more difficult to deliver the baby when the back is down."

How to Get Baby Into the Vertex Position

One way you can help ensure that your baby gets into the vertex position is by staying active and walking, Dr. Purdie says. "Since the head is the heaviest part of the fetus, gravity may help move the head around to the lowest position."

If you already know that your baby is in a non-cephalic position and you are getting close to your delivery date, you also can try some techniques to encourage the baby to turn. For instance, Dr. Purdie suggests getting in the knee/chest position for 10 minutes per day. This has been shown to turn the baby around 60% to 70% of the time.

"In this technique, the mother gets on all fours, places her head down on her hands, and leaves her buttock higher than her head," she explains. "Again, we are trying to allow gravity to help us turn the fetus."

You also might consider visiting a chiropractor to try and help turn the fetus. "Most chiropractors will use the Webster technique to encourage the fetus into a cephalic presentation," Dr. Purdie adds.

There also are some home remedies, including using music, heat, ice, and incense to encourage the fetus to turn, she says. "These techniques do not have a lot of scientific data to support them, but they also are not harmful so can be tried without concern."

You also can try the pelvic tilt , where you lay on your back with your legs bent and your feet on the ground, suggests Dr. DeNoble. Then, you tilt your pelvis up into a bridge position and stay in this position for 10 minutes. She suggests doing this several times a day, ideally when your baby is most active.

"Another technique that has helped some women is to place headphones low down on the abdomen near the pubic bone to encourage the baby to turn toward the sound," Dr. DeNoble adds. "A cold bag of vegetables can be placed at the top of the uterus near the baby’s head and something warm over the lower part of the uterus to encourage the baby to turn toward the warmth. [And] acupuncture has also been used to help turn a baby into a vertex position."

If you are at term and your baby is not in the vertex position (or some type of cephalic presentation), you may want to discuss the option of an external cephalic version (ECV), suggests Dr. Purdie. This is a procedure done in the hospital where your healthcare provider will attempt to manually rotate your baby into the cephalic presentation.

"There are some risks associated with this and not every pregnant person is a candidate, so the details should be discussed with your physician," she says. "If despite interventions, the fetus remains in a non-cephalic position, most physicians will recommend a C-section for delivery."

Keep in mind that there are increased risks for your baby associated with a vaginal breech delivery. Current guidelines by the American College of Obstetricians and Gynecologists recommend a C-section in this situation, Dr. Purdie says.

"Once a pregnant person is in labor, it would be too late for the baby to get in cephalic presentation," she adds.

A Word From Verywell

If your baby is not yet in the vertex position, try not to worry too much. The majority of babies move into either the vertex position or another cephalic presentation before they are born. Until then, focus on staying active, getting plenty of rest, and taking care of yourself.

If you are concerned, talk to your provider about different options for getting your baby to move into the vertex position. They can let you know which tips and techniques might be right for your situation.

American College of Obstetrics and Gynecology. Obstetrics data definitions .

National Library of Medicine. Vaginal delivery .

Sayed Ahmed WA, Hamdy MA. Optimal management of umbilical cord prolapse .  Int J Womens Health . 2018;10:459-465. Published 2018 Aug 21. doi:10.2147/IJWH.S130879

Hjartardóttir H, Lund SH, Benediktsdóttir S, Geirsson RT, Eggebø TM. When does fetal head rotation occur in spontaneous labor at term: results of an ultrasound-based longitudinal study in nulliparous women .  Am J Obstet Gynecol . 2021;224(5):514.e1-514.e9. doi:10.1016/j.ajog.2020.10.054

Management of breech presentation: green-top guideline no. 20b .  BJOG: Int J Obstet Gy . 2017;124(7):e151-e177. doi:10.1111/1471-0528.14465

Kenfack B, Ateudjieu J, Ymele FF, Tebeu PM, Dohbit JS, Mbu RE. Does the advice to assume the knee-chest position at the 36th to 37th weeks of gestation reduce the incidence of breech presentation at delivery?   Clinics in Mother and Child Health . 2012;9:1-5. doi:10.4303/cmch/C120601

Cohain JS. Turning breech babies after 34 weeks: the if, how, & when of turning breech babies .  Midwifery Today Int Midwife . 2007;(83):18-65.

American College of Obstetrics and Gynecology. If your baby is breech .

By Sherri Gordon Sherri Gordon, CLC is a published author, certified professional life coach, and bullying prevention expert. 

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Vertex Presentation : Types, Positions, Complications and Risks

Do not ignore your symptoms!

Find out what could be causing them

Overview 

When babies are about to enter the world, they are either in a vertex, breech, or transverse position. A vertex position means the baby is head-down in the pelvic region, which is the position a baby is required to be during vaginal delivery. 

This blog talks about the vertex position, complications, and the other types of positions the baby can be during delivery. 

What is the vertex position? 

As mentioned earlier, a vertex position is a baby’s position during vaginal delivery. The baby moves into the vertex position  between the 33 rd – 36 th week of pregnancy. In this position, the baby’s head comes out first through the vagina during delivery. However, it is vital to know that the baby can present with other positions like breech (feet-first position) or transverse (lying sideways) position. In such cases, the healthcare provider may suggest alternate birth plans to deliver the baby safely.   

How is a baby delivered in the vertex position?  

When a baby is in a vertex position, it moves through the birth canal and comes out through the vagina. Unlike other mammals that have wider birth canals, humans have smaller ones. Due to the tight space in the birth canal, the baby tends to flex their heads in different ways to fit into the area and enter the world. However, the chances of the baby changing position at the last minute reduce drastically when the baby’s head fits inside the birth canal. The baby can switch to a vertex position anytime during delivery even if it is in a breech or transverse position.

When to seek medical advice?

A pregnant woman can seek medical advice to clear any doubts or clarifications.

What are the other positions a baby may lie in the womb?  

As already mentioned, unborn babies may also assume breech or transverse positions in the womb. The following gives a detailed explanation of both.

Breech Position

In this position, the babies lie in the womb pointing their feet or buttocks toward the vagina of the mother. If the baby stays in a breech position even after 36 weeks of pregnancy, the healthcare provider may try External Cephalic Version (ECV) on the mother. ECV refers to external pressure on the belly to change the baby’s position to a vertex. This procedure is painful for the mother, but it is the safest way to keep the baby in place. In almost 50% of the cases, ECV works and assists the baby in moving into a vertex position. 

In case of vaginal bleeding , the irregular heartbeat of the baby, broken water, or multiple pregnancies, ECV is not recommended. Also, ECV should not be performed if the baby is bigger or smaller than usual, if the placenta is low or if the mother develops high blood pressure and organ damage. The healthcare provider may recommend C-section to deliver the baby in such cases. 

Transverse Position

The baby is lying across the uterus during delivery. The doctors may recommend an ECV procedure. If ECV fails, the healthcare provider may deliver the baby through a C-section .

Can complications happen even when the baby is in the vertex position? 

Even though the vertex position is the correct way a baby should lie during delivery, there are chances of complications. If the baby weighs more than 4.5 kg, it becomes challenging for the baby to manoeuvre out of the birth canal. The shoulders of heavy babies may face trouble moving down the canal. For such babies, doctors regularly conduct checks and are extra cautious during prenatal visits and at the time of birth. For babies above 5 kg, they may recommend alternate delivery options to avoid trauma for both the baby and the mother.  

What are the risks associated with the Breech and Transverse position of the baby? 

Breech and transverse positions can lead to many complications, such as the following:  

ECV issues : While the healthcare provider performs ECV to shift the baby’s position into a vertex position, it may rupture the amniotic sac or tear the placenta. Sometimes it may change the baby’s heartbeat or may induce early labour.  

Problems with breech birth : In the breech position, the baby isn’t able to push the cervical muscles of the mother to come out. Their shoulders or heads may get stuck or impaled by the mother’s pelvis. Also, the umbilical cord may enter the vagina before the baby, reducing blood and oxygen flow to the baby.    

Conclusion 

Vertex position is the right way a baby should lie in the womb during delivery. It doesn’t mean that vertex position does not cause complications. It is crucial to seek expert advice during pregnancy to clarify doubts and address all concerns.  

Frequently Asked Questions (FAQs)

Will the baby turn after being in a vertex position .

Even when the baby is in the proper vertex position, there are chances of them turning to other positions. Expectant mothers with excess amniotic fluid may be a risk of a vertex-positioned baby suddenly becoming breech. Consult the healthcare provider and ask what can be done about keeping the baby in the proper position until delivery.  

How to know if a pregnant woman is having a vertex-positioned baby? 

All healthcare professionals are trained to feel the baby’s position with their hands. This method is known as Leopold’s moves, and they may help find if the baby has a positioned vertex. An ultrasound test also helps precisely find and confirm the baby’s position.  

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Breech Births

In the last weeks of pregnancy, a baby usually moves so his or her head is positioned to come out of the vagina first during birth. This is called a vertex presentation. A breech presentation occurs when the baby’s buttocks, feet, or both are positioned to come out first during birth. This happens in 3–4% of full-term births.

What are the different types of breech birth presentations?

• Complete breech: Here, the buttocks are pointing downward with the legs folded at the knees and feet near the buttocks.
• Frank breech: In this position, the baby’s buttocks are aimed at the birth canal with its legs sticking straight up in front of his or her body and the feet near the head.
• Footling breech: In this position, one or both of the baby’s feet point downward and will deliver before the rest of the body.

What causes a breech presentation?

The causes of breech presentations are not fully understood. However, the data show that breech birth is more common when:

• You have been pregnant before
• In pregnancies of multiples
• When there is a history of premature delivery
• When the uterus has too much or too little amniotic fluid
• When there is an abnormally shaped uterus or a uterus with abnormal growths, such as fibroids
• The placenta covers all or part of the opening of the uterus placenta previa

How is a breech presentation diagnosed?

A few weeks prior to the due date, the health care provider will place her hands on the mother’s lower abdomen to locate the baby’s head, back, and buttocks. If it appears that the baby might be in a breech position, they can use ultrasound or pelvic exam to confirm the position. Special x-rays can also be used to determine the baby’s position and the size of the pelvis to determine if a vaginal delivery of a breech baby can be safely attempted.

Can a breech presentation mean something is wrong?

Even though most breech babies are born healthy, there is a slightly elevated risk for certain problems. Birth defects are slightly more common in breech babies and the defect might be the reason that the baby failed to move into the right position prior to delivery.

Can a breech presentation be changed?

It is preferable to try to turn a breech baby between the 32nd and 37th weeks of pregnancy . The methods of turning a baby will vary and the success rate for each method can also vary. It is best to discuss the options with the health care provider to see which method she recommends.

Medical Techniques

External Cephalic Version (EVC)  is a non-surgical technique to move the baby in the uterus. In this procedure, a medication is given to help relax the uterus. There might also be the use of an ultrasound to determine the position of the baby, the location of the placenta and the amount of amniotic fluid in the uterus.

Gentle pushing on the lower abdomen can turn the baby into the head-down position. Throughout the external version the baby’s heartbeat will be closely monitored so that if a problem develops, the health care provider will immediately stop the procedure. ECV usually is done near a delivery room so if a problem occurs, a cesarean delivery can be performed quickly. The external version has a high success rate and can be considered if you have had a previous cesarean delivery.

ECV will not be tried if:

• You are carrying more than one fetus
• There are concerns about the health of the fetus
• You have certain abnormalities of the reproductive system
• The placenta is in the wrong place
• The placenta has come away from the wall of the uterus ( placental abruption )

Complications of EVC include:

• Prelabor rupture of membranes
• Changes in the fetus’s heart rate
• Placental abruption
• Preterm labor

Vaginal delivery versus cesarean for breech birth?

Most health care providers do not believe in attempting a vaginal delivery for a breech position. However, some will delay making a final decision until the woman is in labor. The following conditions are considered necessary in order to attempt a vaginal birth:

• The baby is full-term and in the frank breech presentation
• The baby does not show signs of distress while its heart rate is closely monitored.
• The process of labor is smooth and steady with the cervix widening as the baby descends.
• The health care provider estimates that the baby is not too big or the mother’s pelvis too narrow for the baby to pass safely through the birth canal.
• Anesthesia is available and a cesarean delivery possible on short notice

What are the risks and complications of a vaginal delivery?

In a breech birth, the baby’s head is the last part of its body to emerge making it more difficult to ease it through the birth canal. Sometimes forceps are used to guide the baby’s head out of the birth canal. Another potential problem is cord prolapse . In this situation the umbilical cord is squeezed as the baby moves toward the birth canal, thus slowing the baby’s supply of oxygen and blood. In a vaginal breech delivery, electronic fetal monitoring will be used to monitor the baby’s heartbeat throughout the course of labor. Cesarean delivery may be an option if signs develop that the baby may be in distress.

When is a cesarean delivery used with a breech presentation?

Most health care providers recommend a cesarean delivery for all babies in a breech position, especially babies that are premature. Since premature babies are small and more fragile, and because the head of a premature baby is relatively larger in proportion to its body, the baby is unlikely to stretch the cervix as much as a full-term baby. This means that there might be less room for the head to emerge.

Want to Know More?

• Creating Your Birth Plan
• Labor & Birth Terms to Know
• Cesarean Birth After Care

Compiled using information from the following sources:

• ACOG: If Your Baby is Breech
• William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al, Ch. 24.
• Danforth’s Obstetrics and Gynecology Ninth Ed. Scott, James R., et al, Ch. 21.

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Vertex Position - Table of Contents

As you approach the due date for your baby’s delivery, the excitement and apprehensions are at their peak! What probably adds to the anxieties are the medical terms describing the baby, its ‘position’ and ‘presentation.’ Let’s strike that out from the list now!

In simple words, ‘ position ’ of the baby is always in reference to the mother ; on what side of the mother’s pelvis does the baby lean more (left or right) and if the baby is facing the mother’s spine or belly (anterior or posterior) – for eg.: Left Occiput Anterior , Right Occiput Anterior , Right Occiput Posterior and so on.

On the other hand, ‘ presentation’ is the body part of baby (head, shoulder, feet, and buttocks) that will enter the mother’s pelvic region first at the beginning of labor.

As ‘ presentation’ depends on the ‘ position’ of the baby, the terms cannot be used interchangeably, which is often mistakenly done. If you are told by your doctor that your baby is in a head-down position , which means its head will enter the pelvic region first , then it means the baby is in ‘vertex’ presentation or even sometimes loosely referred to as vertex position of baby though its conceptually incorrect however it means the same.

With this article, we aim to explain how exactly vertex presentation affects your labor and delivery.

Understanding Vertex Presentation

If your baby is in the head-down position by the third trimester, then you are one of the 95% mothers who have a vertex baby or a vertex delivery. When the baby enters the birth canal head first, then the top part of the head is called the ‘vertex.’

In exact medical terms, we give you the definition of vertex presentation by the American College of Obstetrics and Gynecologists (ACOG) – “a fetal presentation where the head is presenting first in the pelvic inlet.”

Besides vertex presentation (also sometimes referred to as vertex position of baby or vertex fetal position also), the other occasional presentations (non-vertex presentations) include –

• Breech – baby’s feet or buttocks are down and first to enter the mother’s pelvic region. Head is near the mother’s ribs
• Transverse – baby’s shoulder, arm or even the trunk are the first to enter the pelvis, as the baby is laying on the side and not in a vertical position 

It is common that babies turn to a particular position (hence, affecting the presentation) by 34 -36 weeks of pregnancy. Nevertheless, some babies have ‘unstable lies’ ; – wherein the baby keeps changing positions towards the end of the pregnancy and not remaining in any one position for long.

Should you be worried if the baby is in vertex presentation?

Absolutely not! The vertex presentation is not only the most common, but also the best for a smooth delivery. In fact, the chances of a vaginal delivery are better if you have a vertex fetal position.

By 36 weeks into pregnancy, about 95% of the babies position themselves to have the vertex presentation. However, if your baby hasn’t come into the vertex fetal position by this time, then you can talk to your doctor about the options.

You may be suggested a cephalic version procedure   also known as the version procedure /external cephalic version (ECV procedure) – which is used to turn the baby/ fetus from a malpresentation – like breech, oblique or transverse (which occur just about 3-4% times) to the cephalic position (head down).

This is how your doctor will try to turn your baby manually by pushing on your belly to get the baby into the vertex presentation. But it is necessary for you to know that this procedure does involve some risk and is successful only 60-70% of the time.

Continue reading below ↓

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Risks of vertex position of baby: can there be any complications for the baby in the vertex presentation.

As discussed above, the vertex fetal position/presentation is the best for labor and delivery, but there can be some complications as the baby makes its way through the birth canal. One such complication can arise if the baby is on the larger side. The baby can face difficulty while passing through the birth canal even if it is in the head-down position because of the size.

Babies who weigh over 9 to 10 pounds are called ‘ macrosomic’ or even referred to as fetal macrosomia , and they are at a higher risk of getting their shoulders stuck in the birth canal during delivery, despite being in the head-down position.

In such cases, to avoid birth trauma for the baby, the American College of Obstetricians and Gynecologists (ACOG) suggests that cesarean deliveries should be limited to estimated fetal weights of at least 11 pounds in women without diabetes and about 9 pounds in women with diabetes.

In case of fetal macrosomia, your doctor will monitor your pregnancy more often and work out a particular birth plan for you subject to your age (mothers age) and size of your baby.

How will I deliver a baby in the vertex fetal position?

Even unborn human babies can astonish you if you observe the way they make their way through the birth canal during delivery.

A vertex baby may be in the optimal position ( head-down first in pelvis) for labor and delivery, but it does its own twisting and turning while passing through the birth canal to fit through. In humans, unlike other mammals, the ratio of the baby’s head to the space in the birth canal is quite limited.

The baby has to flex and turn its head in different positions to fit through and ultimately arrive in this world. And it does so successfully! It is a wonder how they know how to do this so naturally.

And to answer the question ‘how will I deliver a baby in the vertex position?’ – Simply NATURALLY i.e. vaginal delivery. Don’t worry, follow your doctor’s instructions, do your breathing and PUSH.

FAQs to keep ready: How can my doctor help me prepare as I approach my due date?

As your due date nears, apart from bodily discomfort, you may experience nervousness about the big day. Your doctor can help by clearing your doubts and putting you at ease. You can ask them the following questions to understand the process better.

Q1) How will I know if my baby is in vertex fetal position?

A doctor can confidently tell you whether or not your baby is in the vertex presentation. Many medical professionals will be able to determine your baby’s position merely by using their hands; this is called ‘Leopold’s maneuvers.’

However, in case they aren’t very confident about the baby’s position even after this, then an ultrasound can confirm the exact position of the baby.

You can also understand this through belly mapping . You are sure to feel the kicks towards the top of your stomach and head (distinct hard circular feel) towards your pelvis. 

Q2)Is there any risk of my vertex baby turning and changing positions?

Yes, in case of some women, the baby who has a vertex presentation may turn at the last moment.

What may cause this? Women who have extra amniotic fluid (polyhydramnios) have increased chances of a vertex baby turning into a breech baby at the last minute.

Discuss this with your doctor to understand what are the chances this might happen to you and what all you can do to keep the baby in the vertex presentation for delivery.

Q3) Is there need to be worried if my baby has a breech presentation?

Not really! There are loads of exercises which you which can help you get your baby in the right position.

Then there are the ECV (external cephalic version) procedure which can help in changing the position of your baby into the desired vertex position. Speak with your doctor.

Having a baby in breech position just before labor will require you to have a C-section . Let your doctor guide you. But there is nothing to worry about.

Q4) What may cause babies to come into breech position?

A few circumstances may cause the baby to come into breech position even after 36 weeks into pregnancy.

• If you are carrying twins or multiple babies , in which case there is limited space for each baby to move around.
• Low levels of amniotic fluid which restricts the free movement of the baby or even high levels of amniotic fluid that does not permit the baby to remain in any one position.
• If there are abnormalities in the uterus or other conditions like low-lying placenta or large fibroids in the lower part of the uterus.

Chances of breech babies are higher in births that are pre-term as the baby does not get enough time to flip into a head-down position – cephalic position – vertex presentation (vertex position of baby/ vertex fetal position).

Q5) Can a baby turn from breech position to vertex presentation?

Yes, a baby can turn from a breech position to vertex position / vertex fetal position over time with exercises and sometimes through ECV.

If an ultrasound has confirmed you have a breech baby, then you can do the following to turn it to a vertex baby. Try the following –

• Do not underestimate the wonders of daily walks of about 45-60 mins when it comes to bringing your baby in vertex presentation from breech presentation.
• Talk to your doctor about certain exercises that can help turn your baby in the head-down position. Exercises like ‘ high bridge’ or ‘cat and camel’ can help here. We recommend you to learn and try this only in the presence of a professional.
• External Cephalic Version (ECV ) is a way to manually maneuver the baby to vertex presentation. It is done with the help of an ultrasound and generally after 36 weeks into pregnancy. However, it has the success rate of just 50%. Discuss the risks, if any, with your gynecologist before opting for this procedure.

There are a couple of other unscientific methods that may not be safe to try –

• Light : Placing a torch near your vagina may guide the baby toward the light, and hence, get it in the vertex presentation.
• Music : Playing music near your belly’s bottom may urge the baby to move itself in the head-down position.

Q6) What all can I do to ensure I have a healthy delivery?

A healthy delivery requires the mother to be active, eating well, and staying happy. For any apprehensions regarding labor and delivery, do not hesitate to talk to your doctor and clarify your doubts.

Your doctor can help you understand your baby’s position and presentation, and then based on that they can plan your delivery to ensure your baby’s birth will happen in the safest possible way.

Try and maintain a healthy lifestyle which will also help in overall of your child and placenta health .

Key Takeaway

Yes, vertex presentation or vertex position of baby and vertex delivery are very common, normal, safe, and the best for labor and delivery of the baby. There is probability of complications sometimes, but that is only subject to certain conditions that we discussed above.

However, understand that any other baby position is also safe. The only thing with other positions and presentations is that the chances of a cesarean delivery goes up. Nevertheless, know what matters at the end of it all is a happy and healthy baby in your arms!

Happy pregnancy!

Khushboo Kirale

You may also be interested in.

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• Pregnancy week by week
• Fetal presentation before birth

The way a baby is positioned in the uterus just before birth can have a big effect on labor and delivery. This positioning is called fetal presentation.

Babies twist, stretch and tumble quite a bit during pregnancy. Before labor starts, however, they usually come to rest in a way that allows them to be delivered through the birth canal headfirst. This position is called cephalic presentation. But there are other ways a baby may settle just before labor begins.

Following are some of the possible ways a baby may be positioned at the end of pregnancy.

Head down, face down

When a baby is head down, face down, the medical term for it is the cephalic occiput anterior position. This the most common position for a baby to be born in. With the face down and turned slightly to the side, the smallest part of the baby's head leads the way through the birth canal. It is the easiest way for a baby to be born.

Head down, face up

When a baby is head down, face up, the medical term for it is the cephalic occiput posterior position. In this position, it might be harder for a baby's head to go under the pubic bone during delivery. That can make labor take longer.

Most babies who begin labor in this position eventually turn to be face down. If that doesn't happen, and the second stage of labor is taking a long time, a member of the health care team may reach through the vagina to help the baby turn. This is called manual rotation.

In some cases, a baby can be born in the head-down, face-up position. Use of forceps or a vacuum device to help with delivery is more common when a baby is in this position than in the head-down, face-down position. In some cases, a C-section delivery may be needed.

Frank breech

When a baby's feet or buttocks are in place to come out first during birth, it's called a breech presentation. This happens in about 3% to 4% of babies close to the time of birth. The baby shown below is in a frank breech presentation. That's when the knees aren't bent, and the feet are close to the baby's head. This is the most common type of breech presentation.

If you are more than 36 weeks into your pregnancy and your baby is in a frank breech presentation, your health care professional may try to move the baby into a head-down position. This is done using a procedure called external cephalic version. It involves one or two members of the health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

If the procedure isn't successful, or if the baby moves back into a breech position, talk with a member of your health care team about the choices you have for delivery. Most babies in a frank breech position are born by planned C-section.

Complete and incomplete breech

A complete breech presentation, as shown below, is when the baby has both knees bent and both legs pulled close to the body. In an incomplete breech, one or both of the legs are not pulled close to the body, and one or both of the feet or knees are below the baby's buttocks. If a baby is in either of these positions, you might feel kicking in the lower part of your belly.

If you are more than 36 weeks into your pregnancy and your baby is in a complete or incomplete breech presentation, your health care professional may try to move the baby into a head-down position. This is done using a procedure called external cephalic version. It involves one or two members of the health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

If the procedure isn't successful, or if the baby moves back into a breech position, talk with a member of your health care team about the choices you have for delivery. Many babies in a complete or incomplete breech position are born by planned C-section.

When a baby is sideways — lying horizontal across the uterus, rather than vertical — it's called a transverse lie. In this position, the baby's back might be:

• Down, with the back facing the birth canal.
• Sideways, with one shoulder pointing toward the birth canal.
• Up, with the hands and feet facing the birth canal.

Although many babies are sideways early in pregnancy, few stay this way when labor begins.

If your baby is in a transverse lie during week 37 of your pregnancy, your health care professional may try to move the baby into a head-down position. This is done using a procedure called external cephalic version. External cephalic version involves one or two members of your health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

If the procedure isn't successful, or if the baby moves back into a transverse lie, talk with a member of your health care team about the choices you have for delivery. Many babies who are in a transverse lie are born by C-section.

If you're pregnant with twins and only the twin that's lower in the uterus is head down, as shown below, your health care provider may first deliver that baby vaginally.

Then, in some cases, your health care team may suggest delivering the second twin in the breech position. Or they may try to move the second twin into a head-down position. This is done using a procedure called external cephalic version. External cephalic version involves one or two members of the health care team putting pressure on your belly with their hands to get the baby to roll into a head-down position.

Your health care team may suggest delivery by C-section for the second twin if:

• An attempt to deliver the baby in the breech position is not successful.
• You do not want to try to have the baby delivered vaginally in the breech position.
• An attempt to move the baby into a head-down position is not successful.
• You do not want to try to move the baby to a head-down position.

In some cases, your health care team may advise that you have both twins delivered by C-section. That might happen if the lower twin is not head down, the second twin has low or high birth weight as compared to the first twin, or if preterm labor starts.

• Landon MB, et al., eds. Normal labor and delivery. In: Gabbe's Obstetrics: Normal and Problem Pregnancies. 8th ed. Elsevier; 2021. https://www.clinicalkey.com. Accessed May 19, 2023.
• Holcroft Argani C, et al. Occiput posterior position. https://www.updtodate.com/contents/search. Accessed May 19, 2023.
• Frequently asked questions: If your baby is breech. American College of Obstetricians and Gynecologists https://www.acog.org/womens-health/faqs/if-your-baby-is-breech. Accessed May 22, 2023.
• Hofmeyr GJ. Overview of breech presentation. https://www.updtodate.com/contents/search. Accessed May 22, 2023.
• Strauss RA, et al. Transverse fetal lie. https://www.updtodate.com/contents/search. Accessed May 22, 2023.
• Chasen ST, et al. Twin pregnancy: Labor and delivery. https://www.updtodate.com/contents/search. Accessed May 22, 2023.
• Cohen R, et al. Is vaginal delivery of a breech second twin safe? A comparison between delivery of vertex and non-vertex second twins. The Journal of Maternal-Fetal & Neonatal Medicine. 2021; doi:10.1080/14767058.2021.2005569.
• Marnach ML (expert opinion). Mayo Clinic. May 31, 2023.

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StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-.

StatPearls [Internet].

Delivery, face and brow presentation.

Julija Makajeva ; Mohsina Ashraf .

Affiliations

Last Update: January 9, 2023 .

• Continuing Education Activity

Face and brow presentation is a malpresentation during labor when the presenting part is either the face or, in the case of brow presentation, it is the area between the orbital ridge and the anterior fontanelle. This activity reviews the evaluation and management of these two presentations and explains the role of the interprofessional team in managing delivery safely for both the mother and the baby.

• Describe the mechanism of labor in the face and brow presentation.
• Summarize potential maternal and fetal complications during the face and brow presentations.
• Review different management approaches for the face and brow presentation.
• Outline some interprofessional strategies that will improve patient outcomes in delivery cases with face and brow presentation issues.
• Introduction

The term presentation describes the leading part of the fetus or the anatomical structure closest to the maternal pelvic inlet during labor. The presentation can roughly be divided into the following classifications: cephalic, breech, shoulder, and compound. Cephalic presentation is the most common and can be further subclassified as vertex, sinciput, brow, face, and chin. The most common presentation in term labor is the vertex, where the fetal neck is flexed to the chin, minimizing the head circumference.

Face presentation – an abnormal form of cephalic presentation where the presenting part is mentum. This typically occurs because of hyperextension of the neck and the occiput touching the fetal back. Incidence of face presentation is rare, accounting for approximately 1 in 600 of all presentations. [1] [2] [3]

In brow presentation, the neck is not extended as much as in face presentation, and the leading part is the area between the anterior fontanelle and the orbital ridges. Brow presentation is considered the rarest of all malpresentation with a prevalence of 1 in 500 to 1 in 4000 deliveries. [3]

Both face and brow presentations occur due to extension of the fetal neck instead of flexion; therefore, conditions that would lead to hyperextension or prevent flexion of the fetal neck can all contribute to face or brow presentation. These risk factors may be related to either the mother or the fetus. Maternal risk factors are preterm delivery, contracted maternal pelvis, platypelloid pelvis, multiparity, previous cesarean section, black race. Fetal risk factors include anencephaly, multiple loops of cord around the neck, masses of the neck, macrosomia, polyhydramnios. [2] [4] [5]

These malpresentations are usually diagnosed during the second stage of labor when performing a digital examination. It is possible to palpate orbital ridges, nose, malar eminences, mentum, mouth, gums, and chin in face presentation. Based on the position of the chin, face presentation can be further divided into mentum anterior, posterior, or transverse. In brow presentation, anterior fontanelle and face can be palpated except for the mouth and the chin. Brow presentation can then be further described based on the position of the anterior fontanelle as frontal anterior, posterior, or transverse.

Diagnosing the exact presentation can be challenging, and face presentation may be misdiagnosed as frank breech. To avoid any confusion, a bedside ultrasound scan can be performed. [6]  The ultrasound imaging can show a reduced angle between the occiput and the spine or, the chin is separated from the chest. However, ultrasound does not provide much predicting value in the outcome of the labor. [7]

• Anatomy and Physiology

Before discussing the mechanism of labor in the face or brow presentation, it is crucial to highlight some anatomical landmarks and their measurements. 

Planes and Diameters of the Pelvis

The three most important planes in the female pelvis are the pelvic inlet, mid pelvis, and pelvic outlet. 

Four diameters can describe the pelvic inlet: anteroposterior, transverse, and two obliques. Furthermore, based on the different landmarks on the pelvic inlet, there are three different anteroposterior diameters, named conjugates: true conjugate, obstetrical conjugate, and diagonal conjugate. Only the latter can be measured directly during the obstetric examination. The shortest of these three diameters is obstetrical conjugate, which measures approximately 10.5 cm and is a distance between the sacral promontory and 1 cm below the upper border of the symphysis pubis. This measurement is clinically significant as the fetal head must pass through this diameter during the engagement phase. The transverse diameter measures about 13.5cm and is the widest distance between the innominate line on both sides. 

The shortest distance in the mid pelvis is the interspinous diameter and usually is only about 10 cm. 

Fetal Skull Diameters

There are six distinguished longitudinal fetal skull diameters:

• Suboccipito-bregmatic: from the center of anterior fontanelle (bregma) to the occipital protuberance, measuring 9.5 cm. This is the presenting diameter in vertex presentation. 
• Suboccipito-frontal: from the anterior part of bregma to the occipital protuberance, measuring 10 cm 
• Occipito-frontal: from the root of the nose to the most prominent part of the occiput, measuring 11.5cm
• Submento-bregmatic: from the center of the bregma to the angle of the mandible, measuring 9.5 cm. This is the presenting diameter in face presentation where the neck is hyperextended. 
• Submento-vertical: from the midpoint between fontanelles and the angle of the mandible, measuring 11.5cm 
• Occipito-mental: from the midpoint between fontanelles and the tip of the chin, measuring 13.5 cm. It is the presenting diameter in brow presentation. 

Cardinal Movements of Normal Labor

• Neck flexion
• Internal rotation
• Extension (delivers head)
• External rotation (Restitution)
• Expulsion (delivery of anterior and posterior shoulders)

Some of the key movements are not possible in the face or brow presentations.  

Based on the information provided above, it is obvious that labor will be arrested in brow presentation unless it spontaneously changes to face or vertex, as the occipito-mental diameter of the fetal head is significantly wider than the smallest diameter of the female pelvis. Face presentation can, however, be delivered vaginally, and further mechanisms of face delivery will be explained in later sections.

• Indications

As mentioned previously, spontaneous vaginal delivery can be successful in face presentation. However, the main indication for vaginal delivery in such circumstances would be a maternal choice. It is crucial to have a thorough conversation with a mother, explaining the risks and benefits of vaginal delivery with face presentation and a cesarean section. Informed consent and creating a rapport with the mother is an essential aspect of safe and successful labor.

• Contraindications

Vaginal delivery of face presentation is contraindicated if the mentum is lying posteriorly or is in a transverse position. In such a scenario, the fetal brow is pressing against the maternal symphysis pubis, and the short fetal neck, which is already maximally extended, cannot span the surface of the maternal sacrum. In this position, the diameter of the head is larger than the maternal pelvis, and it cannot descend through the birth canal. Therefore the cesarean section is recommended as the safest mode of delivery for mentum posterior face presentations. 

Attempts to manually convert face presentation to vertex, manual or forceps rotation of the persistent posterior chin to anterior are contraindicated as they can be dangerous.

Persistent brow presentation itself is a contraindication for vaginal delivery unless the fetus is significantly small or the maternal pelvis is large.

Continuous electronic fetal heart rate monitoring is recommended for face and brow presentations, as heart rate abnormalities are common in these scenarios. One study found that only 14% of the cases with face presentation had no abnormal traces on the cardiotocograph. [8] It is advised to use external transducer devices to prevent damage to the eyes. When internal monitoring is inevitable, it is suggested to place monitoring devices on bony parts carefully. 

People who are usually involved in the delivery of face/ brow presentation are:

• Experienced midwife, preferably looking after laboring woman 1:1
• Senior obstetrician 
• Neonatal team - in case of need for resuscitation 
• Anesthetic team - to provide necessary pain control (e.g., epidural)
• Theatre team  - in case of failure to progress and an emergency cesarean section will be required.
• Preparation

No specific preparation is required for face or brow presentation. However, it is essential to discuss the labor options with the mother and birthing partner and inform members of the neonatal, anesthetic, and theatre co-ordinating teams.

• Technique or Treatment

Mechanism of Labor in Face Presentation

During contractions, the pressure exerted by the fundus of the uterus on the fetus and pressure of amniotic fluid initiate descent. During this descent, the fetal neck extends instead of flexing. The internal rotation determines the outcome of delivery, if the fetal chin rotates posteriorly, vaginal delivery would not be possible, and cesarean section is permitted. The approach towards mentum-posterior delivery should be individualized, as the cases are rare. Expectant management is acceptable in multiparous women with small fetuses, as a spontaneous mentum-anterior rotation can occur. However, there should be a low threshold for cesarean section in primigravida women or women with large fetuses.

When the fetal chin is rotated towards maternal symphysis pubis as described as mentum-anterior; in these cases further descend through the vaginal canal continues with approximately 73% cases deliver spontaneously. [9] Fetal mentum presses on the maternal symphysis pubis, and the head is delivered by flexion. The occiput is pointing towards the maternal back, and external rotation happens. Shoulders are delivered in the same manner as in vertex delivery.

Mechanism of Labor in Brow Presentation

As this presentation is considered unstable, it is usually converted into a face or an occiput presentation. Due to the cephalic diameter being wider than the maternal pelvis, the fetal head cannot engage; thus, brow delivery cannot take place. Unless the fetus is small or the pelvis is very wide, the prognosis for vaginal delivery is poor. With persistent brow presentation, a cesarean section is required for safe delivery.

• Complications

As the cesarean section is becoming a more accessible mode of delivery in malpresentations, the incidence of maternal and fetal morbidity and mortality during face presentation has dropped significantly. [10]

However, there are still some complications associated with the nature of labor in face presentation. Due to the fetal head position, it is more challenging for the head to engage in the birth canal and descend, resulting in prolonged labor.

Prolonged labor itself can provoke foetal distress and arrhythmias. If the labor arrests or signs of fetal distress appear on CTG, the recommended next step in management is an emergency cesarean section, which in itself carries a myriad of operative and post-operative complications.

Finally, due to the nature of the fetal position and prolonged duration of labor in face presentation, neonates develop significant edema of the skull and face. Swelling of the fetal airway may also be present, resulting in respiratory distress after birth and possible intubation.

• Clinical Significance

During vertex presentation, the fetal head flexes, bringing the chin to the chest, forming the smallest possible fetal head diameter, measuring approximately 9.5cm. With face and brow presentation, the neck hyperextends, resulting in greater cephalic diameters. As a result, the fetal head will engage later, and labor will progress more slowly. Failure to progress in labor is also more common in both presentations compared to vertex presentation.

Furthermore, when the fetal chin is in a posterior position, this prevents further flexion of the fetal neck, as browns are pressing on the symphysis pubis. As a result, descend through the birth canal is impossible. Such presentation is considered undeliverable vaginally and requires an emergency cesarean section.

Manual attempts to change face presentation to vertex, manual or forceps rotation to mentum anterior are considered dangerous and are discouraged.

• Enhancing Healthcare Team Outcomes

A multidisciplinary team of healthcare experts supports the woman and her child during labor and the perinatal period. For a face or brow presentation to be appropriately diagnosed, an experienced midwife and obstetrician must be involved in the vaginal examination and labor monitoring. As fetal anomalies, such as anencephaly or goiter, can contribute to face presentation, sonographers experienced in antenatal scanning should also be involved in the care. It is advised to inform the anesthetic and neonatal teams in advance of the possible need for emergency cesarean section and resuscitation of the neonate. [11] [12]

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Disclosure: Julija Makajeva declares no relevant financial relationships with ineligible companies.

Disclosure: Mohsina Ashraf declares no relevant financial relationships with ineligible companies.

This book is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits others to distribute the work, provided that the article is not altered or used commercially. You are not required to obtain permission to distribute this article, provided that you credit the author and journal.

• Cite this Page Makajeva J, Ashraf M. Delivery, Face and Brow Presentation. [Updated 2023 Jan 9]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-.

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• Sonographic diagnosis of fetal head deflexion and the risk of cesarean delivery. [Am J Obstet Gynecol MFM. 2020] Sonographic diagnosis of fetal head deflexion and the risk of cesarean delivery. Bellussi F, Livi A, Cataneo I, Salsi G, Lenzi J, Pilu G. Am J Obstet Gynecol MFM. 2020 Nov; 2(4):100217. Epub 2020 Aug 18.
• Review Sonographic evaluation of the fetal head position and attitude during labor. [Am J Obstet Gynecol. 2022] Review Sonographic evaluation of the fetal head position and attitude during labor. Ghi T, Dall'Asta A. Am J Obstet Gynecol. 2022 Jul 6; . Epub 2022 Jul 6.
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Abnormal Fetal Position and Presentation

Under normal circumstances, a baby is in the vertex (cephalic) position before delivery. In the vertex position, the baby’s head is at the lower part of the abdomen, and the baby is born head-first. However, some babies present differently before delivery. In these cases, abnormal presentations may place the baby at risk of experiencing umbilical cord problems and/or a birth trauma (1). Types of abnormal fetal positions and presentations include the following. We’ll cover each in more detail on this page.

What is the difference between fetal presentation and position?

In the womb, a fetus has both a presentation and a position . Presentation refers to the baby’s body that leads, or is expected to lead, out of the birth canal (9). For example, if a baby’s rear is set to come out of the birth canal first, the baby is said to be in “breech presentation.” Position refers to the direction the baby is facing in relation to the mother’s spine (9). A baby could be lying face-first against a mother’s spine, or face up towards the mother’s belly.

What way should a baby come out during birth?

Vertex presentation is the ‘normal’ way that a baby is positioned for birth and the lowest-risk presentation for vaginal birth (1). In vertex presentation, the baby is positioned head-first with their occiput (the part of the head close to the base of the skull) entering the birth canal first. In this position, the baby’s chin is tucked into their chest and they are facing the mother’s back (occipito-anterior position). Any position other than vertex position is abnormal and can make vaginal delivery much more difficult or sometimes impossible (2). If a baby’s chin isn’t tucked into their chest, they may come out face-first (face presentation), which can cause birth injury (1).

What happens if a baby isn’t in the standard vertex position during birth?

Before delivery, it is critical that the fetus is in the standard vertex presentation and within the normal range for weight and size. This helps ensure the safety of both baby and mother during labor. When the baby’s size or position is abnormal, physician intervention is usually warranted (1). This may mean simple manual procedures to help reposition the baby or, in many cases, a planned C-section delivery . The failure of healthcare professionals to identify and quickly resolve issues related to fetal size, weight, and presentation is medical malpractice . There are numerous complications related to abnormal weight, size, abnormal position, or abnormal presentation.

Compound presentation

In the safest presentation (vertex presentation), the baby is born head first, with the rest of the body following. In a compound presentation, however, there are multiple presenting parts. Most commonly, this means that the baby’s head and an arm come out first at the same time. Sometimes compound presentation can occur with twins where the head of the first twin presents with the extremity of the second twin (3).

Risk factors for compound presentation include (3):

• Prematurity
• Intrauterine growth restriction (IUGR)
• Multiple gestations ( twins , triplets, etc.)
• Polyhydramnios
• A large pelvis
• External cephalic version
• Rupture of membranes at high station

Compound presentations can be detected via ultrasound before the mother’s water breaks. During labor, compound presentation is identified as an irregular finding during a cervical examination (3).

If a mother has polyhydramnios, the risk of compound presentation is higher, as the flow of amniotic fluid when the membranes rupture can sweep extremities into the birth canal, or cause a cord prolapse , which is a medical emergency (3). If compound presentation continues, it is likely to cause dystocia (the baby becoming stuck in the birth canal), which is also a medical emergency (3). Often, the safest way to deliver a baby with compound presentation is C-section, because complications like dystocia and cord prolapse carry risks of severe adverse outcomes, including cerebral palsy , intellectual and developmental disabilities, and hypoxic-ischemic encephalopathy (HIE) (3).

Limb presentation

Limb presentation during childbirth means that the part of the baby’s body that emerges first is a limb – an arm or a leg. Babies with limb presentation cannot be delivered safely via vaginal delivery; they must be delivered quickly by emergency C-section (4). Limb presentation poses a large risk for dystocia (the baby getting stuck on the mother’s pelvis), which is a medical emergency.

Occipitoposterior (OP) position

Approximately 1 out of 19 babies present  in a posterior position rather than an anterior position. This  is called an occipitoposterior (OP) position or occiput posterior position (3)  In OP position, the baby is head-first with the back part of the head turned towards the mother’s back, rotated to the right  (right occipitoposterior position, or ROP), or to the left (left occipitoposterior position, or LOP) of the sacroiliac joint. Occipitoposterior position increases the baby’s risk of experiencing prolonged labor , prolapsed umbilical cord , and use of delivery instruments, such as forceps and vacuum extractors (5). These conditions can cause brain bleeds , a lack of oxygen to the brain, and birth asphyxia .

When OP position is present, if a manual rotation cannot be quickly and effectively performed in the face of fetal distress, the baby should be delivered via C-section (5).  A C-section can help prevent oxygen deprivation caused by prolonged labor, umbilical cord prolapse, or forceps and vacuum extractor use.

A nurse explains posterior position

Breech presentation

Breech presentation is normal throughout pregnancy. However, by the 37th week, the baby should turn to the cephalic position in time for labor. Breech presentation occurs when a baby’s buttocks or legs are positioned to descend the birth canal first. Breech positions are dangerous because when vaginal delivery is attempted, a baby is at increased risk for prolapsed umbilical cord, traumatic head injury, spinal cord fracture, fatality, and other serious problems with labor (6).

There are 4 types of breech positions:

• Footling breech presentation : In footling position, one or both feet enter the birth canal first, with the buttocks at a higher position than the feet.
• Kneeling breech presentation : This is when the baby has one or both legs extended at the hips and flexed at the knees.
• Frank breech presentation : This is when the baby’s buttocks present first, the legs are flexed at the hip and extended at the knees, and the feet are near the ears.
• Complete breech presentation : In this position, the baby’s hips and knees are flexed so that the baby is sitting cross-legged, with the feet beside the buttocks.

When a baby is in breech position, physicians often try to maneuver the baby into a head-first position. This should only be attempted if fetal heart tracings are normal (the baby is not in distress ) (7). The only type of breech position that may allow for a vaginal delivery is frank breech , and the following conditions must be met:

• The baby’s heart rate is being closely monitored and the baby is not in distress.
• Cephalopelvic disproportion (CPD) is not present; x-rays and ultrasound show that the size of the mother’s pelvis will allow a safe vaginal birth.
• The hospital is equipped for and the physician is skilled in performing an emergency C-section .

If these conditions are not present, vaginal birth should not be attempted. Most experts recommend C-section delivery for all types of breech positions because it is the safest method of delivery and it helps avoid birth injuries (6). Mismanaged breech birth can result in the following conditions:

• Brain bleeds, intracranial hemorrhages
• Spinal cord fractures
• Hypoxic-ischemic encephalopathy (HIE)
• Cerebral palsy
• Intellectual disabilities
• Developmental delays

Face presentation

A face presentation occurs when the face is the presenting part of the baby. In this position, the baby’s neck is deflexed (extended backward) so that the back of the head touches the baby’s back. This prevents head engagement and descent of the baby through the birth canal. In some cases of face presentation, the trauma of a vaginal delivery causes face deformation and fluid build-up (edema) in the face and upper airway, which often means the baby will need a breathing tube placed in the airway to maintain airway patency and assist breathing (1).

Image by healthhand.com

There are three types of face presentation:

• Mentum anterior (MA) : In this position, the chin is facing the front of the mother.
• Mentum posterior (MP) : The chin is facing the mother’s back, pointing down towards her buttocks in mentum posterior position. In this position, the baby’s head, neck, and shoulders enter the pelvis at the same time, and the pelvis is usually not large enough to accommodate this. Also, an open fetal mouth can push against the bone (sacrum) at the upper and back part of the pelvis, which also can prevent descent of the baby through the birth canal.
• Mentum transverse (MT) : The baby’s chin is facing the side of the birth canal in this position.

Trauma is very common during vaginal delivery of a baby in face presentation, so parents must be warned that their baby may be bruised and that a C-section is available to avoid this trauma.

Babies presenting face-first can sometimes be delivered vaginally, as long as the baby is in MA position (1). Safe vaginal delivery of a term-sized infant in persistent MP position is impossible due to the presenting part of the baby compared to the size of the mother’s pelvis (1). Babies in MP position must be delivered by C-section. Babies in MT position must also be delivered by C-section. Some babies in the MP and MT positions will spontaneously convert to the MA position during the course of labor, which makes vaginal delivery a possibility. If the baby is in the MA position and vaginal delivery is able to proceed, engagement of the presenting part of the baby probably will not occur until the face is at a +2 station (1).

The management of face presentation requires close observation of the progress of labor due to the high incidence of CPD with face presentation. In face presentation, the diameter of the presenting part of the head is, on average, 0.7 cm greater than in the normal vertex position (1).

In any face presentation situation, if progress in dilation and descent ceases despite adequate contractions, delivery must occur by C-section. In fact, when face presentation occurs, experts recommend liberal use of C-section (1).

Since there is an increased risk of trauma to the baby when the face presents, the physician should not try to rotate the baby internally. In addition, the physician must not use vacuum extractors or manual extraction (grasping the baby with hands) to extract the baby from the uterine cavity. Outlet forceps should only be used by experienced physicians; these forceps increase the risk of trauma and brain bleeds. In almost all clinical circumstances a cesarean delivery is the safest method of delivery.

Listed below are complications that can occur if face presentation is mismanaged by the medical team:

• Prolonged labor
• Facial trauma
• Facial and upper airway edema (fluid build-up in the face, often caused by trauma)
• Skull molding (abnormal head shape that results from pressure on the baby’s head during childbirth)
• Respiratory distress or difficulty in ventilation (the baby being able to move air in and out of lungs) due to upper airway trauma and edema
• Spinal cord injury
• Abnormal fetal heart rate patterns
• 10-fold increase in fetal compromise
• Brain bleeds
• Intracranial hemorrhages
• Permanent brain damage

Brow presentation

Brow presentation is similar to face presentation, but the baby’s neck is less extended. A fetus in brow presentation has the chin untucked, and the neck is extended slightly backward. As the term “brow presentation” suggests, the brow (forehead) is the part that is situated to go through the pelvis first. Vaginal delivery can be difficult or impossible with brow presentation, because the diameter of the presenting part of the head may be too big to safely fit through the pelvis.

Risk factors and conditions associated with brow presentation

Brow presentation has been linked to several risk factors and co-occurring conditions. These include:

• Multiparity (having previously given birth)
• Premature delivery
• Fetal anomalies such as anencephaly (an absence of major parts of the brain and skull) or anterior neck mass (a growth on the front of the neck)
• Previous c-section delivery
• Polyhydramnios (excessive amniotic fluid: infants swallow amniotic fluid while in utero, but this may be difficult if their neck is extended)

Diagnosis of brow presentation

Brow presentation can often be diagnosed through a vaginal examination during labor. If there are no conclusive signs from the physical examination alone, an ultrasound can also be used. Warning signs of brow presentation may include signs of fetal distress or lack of labor progression.

Management of brow presentation

Infants who assume a brow presentation early in labor may spontaneously move into a more optimal position during the delivery process. Additionally, safe delivery in brow presentation may be possible if the infant is unusually small and/or the mother’s pelvic opening is unusually large. For these reasons, physicians occasionally recommend vaginal delivery of infants in brow presentation.

Doctors attempting vaginal delivery of a baby in brow presentation must be very careful to watch for signs of fetal distress (such as an abnormal heart rate), and to monitor the progression of labor. Prolonged labor can cause extended periods of fetal oxygen deprivation, which can cause birth asphyxia and permanent injury. Signs of fetal distress can indicate that a baby is in danger of sustaining serious brain damage if action is not quickly taken to prevent this. If an infant in brow presentation begins to show signs of distress, or if labor progress stops or slows significantly, physicians should be ready to move on to a cesarean delivery.

Labor induction or augmentation with the drug Pitocin (synthetic oxytocin) is very dangerous in cases of brow presentation. Pitocin can lead to excessive uterine contractions, which can put pressure on the infant’s head and cut off their oxygen supply; this is especially risky when safe fetal descent is already compromised, such as in cases of brow presentation.

Complications of brow presentation

If brow presentation is diagnosed in a timely fashion and is appropriately managed, there are typically no serious negative effects on the mother or baby. However, if medical professionals fail to recognize brow presentation and intervene as necessary, there can be lasting consequences. Infants may suffer  oxygen deprivation  due to prolonged labor, or  traumatic injuries from a difficult delivery. Some of the most severe conditions resulting from mismanaged brow presentation births include:

• Hypoxic-ischemic encephalopathy
• Periventricular leukomalacia
• Seizure disorders
• Developmental disabilities

Shoulder presentation (transverse lie)

Shoulder presentation (transverse lie) is when the arm, shoulder or trunk of the baby enter the birth canal first. When a baby is in a transverse lie position during labor, C-section is almost always used as the delivery method (8).  Mothers who have polyhydramnios (too much amniotic fluid), are pregnant with more than one baby, have placenta previa, or have a baby with intrauterine growth restriction (IUGR) are more likely to have a baby in the transverse lie position (8). Once the membranes rupture, there is an increased risk of umbilical cord prolapse in this position; thus, a C-section should ideally be performed before the membranes break (8). Failure to quickly deliver the baby by C-section when transverse lie presentation is present can cause severe birth asphyxia due to cord compression and trauma to the baby. This can cause hypoxic-ischemic encephalopathy (HIE), seizures, permanent brain damage, and cerebral palsy.

Legal help for birth injuries from abnormal position or presentation

The award-winning birth injury attorneys at ABC Law Centers have over 100 years of joint experience handling birth trauma cases related to abnormal position or presentation. If you believe your loved one’s birth injury resulted from an instance of medical malpractice, you may be entitled to compensation from a medical malpractice or personal injury case. During your free legal consultation, our birth injury attorneys will discuss your case with you, determine if negligence caused your loved one’s injuries, identify the negligent party, and discuss your legal options with you.

• Free Case Review
• Available 24/7
• No Fee Unless We Win

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• Julien, S., and Galerneau, F. (2017). Face and brow presentations in labor. Retrieved from https://www.uptodate.com/contents/face-and-brow-presentations-in-labor .
• World Health Organization, UNICEF, and United Nations Population Fund. Malpositions and malpresentations. Retrieved from http://hetv.org/resources/reproductive-health/impac/Symptoms/Malpositions__malpresetations_S69_S81.html .
• Barth, W. (2016). Compound fetal presentation. Retrieved from https://www.uptodate.com/contents/compound-fetal-presentation .
• Gabbe, S.G., … Grobman, W.A. (2017). Compound Presentation. Retrieved from https://expertconsult.inkling.com/read/gabbe-obstetrics-normal-problem-pregnancies-7e/chapter-17/compound-presentation .
• Argani, C.H. and Satin, A.J. (2018) Occiput posterior position. Retrieved from https://www.uptodate.com/contents/occiput-posterior-position .
• Hofmeyr, G.J. (2018). Overview of issues related to breech presentation. Retrieved from https://www.uptodate.com/contents/overview-of-issues-related-to-breech-presentation .
• Hofmeyr, G.J. (2017). Delivery of the fetus in breech presentation. Retrieved from https://www.uptodate.com/contents/delivery-of-the-fetus-in-breech-presentation .
• Strauss, R.A. (2017). Transverse fetal lie. Retrieved from https://www.uptodate.com/contents/transverse-fetal-lie .
• Moldenhauer, J.S. (2018). Abnormal Position and Presentation of the Fetus. Retrieved from https://www.merckmanuals.com/home/women-s-health-issues/complications-of-labor-and-delivery/abnormal-position-and-presentation-of-the-fetus .

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vertex presentation

Medical Definition of vertex presentation

Dictionary entries near vertex presentation, cite this entry.

“Vertex presentation.” Merriam-Webster.com Medical Dictionary , Merriam-Webster, https://www.merriam-webster.com/medical/vertex%20presentation. Accessed 22 Apr. 2024.

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What moms need to know about c-sections

In maternal healthcare, cesarean sections are often necessary due to complications during labor or delivery. Courtney Martin, DO, medical director of quality improvement at Loma Linda University Children's Hospital, outlines common reasons for cesarean deliveries, including fetal distress, prolonged labor, breech presentation, placenta previa, or previous cesarean deliveries where vaginal birth after cesarean isn't feasible.

Recovery from cesarean sections typically requires a longer hospital stay and increased discomfort compared to vaginal delivery. Martin advises mothers to prioritize rest, avoid heavy lifting, and maintain proper wound care. While most women fully recover from a cesarean, there are potential implications for future pregnancies, such as scar tissue leading to complications like placenta accreta or uterine rupture. Women with a history of cesarean delivery need to discuss their options with their healthcare provider when planning future pregnancies.

Misconceptions

Martin says there is a belief that choosing a cesarean represents taking the "easy way out." Martin clarifies that not all cesareans are avoidable and refutes the notion that doctors prefer cesarean deliveries over vaginal births.

"Reducing unnecessary cesareans promotes a patient-centered approach to childbirth, ensuring that interventions are only utilized when medically necessary and allowing women to have more control over their birth experiences. Overall, avoiding unnecessary cesareans is essential for promoting the health and well-being of both mothers and babies, minimizing risks, and preserving future reproductive options," Martin said.

A planned cesarean allows for careful scheduling and preparation, often resulting in a smoother experience for the mother and medical team. This is often done for a repeat cesarean, malpresentation of the baby, or abnormal placental location. An emergency cesarean is performed when there's an immediate threat to the health or life of the mother or baby. Timely intervention is crucial for ensuring the best possible outcomes for both.

Preventive Measures at LLUCH

Acknowledging the importance of preventing unnecessary cesarean sections, particularly among women who have not given birth, have reached 37 weeks gestation, aren't pregnant with twins, and the baby is not in breech or transverse positions, or Nulliparous, Term, Singleton, Vertex (NTSV).

Encouraging vaginal birth through evidence-based practices, education, and informed decision-making supports safer outcomes, preserves future reproductive options, and aligns with women's birth preferences and values and is a core value of the care provided in the San Manuel Maternity Pavilion at LLUCH.

Loma Linda University Children's Hospital and Loma Linda University Medical Center–Murrieta have been recognized as part of the U.S. News & World Report's 2024 High Performing Hospital for Maternity Care. This distinction is based on their national performance in various rankings, including low newborn complications, fewer early deliveries, and reduced c-section rates.

Visit us online for more information on maternity care services at  Children’s Hospital  or  LLUMC-Murrieta . 

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Google Cloud Next 2024: Everything announced so far

Google’s Cloud Next 2024 event takes place in Las Vegas through Thursday, and that means lots of new cloud-focused news on everything from Gemini, Google’s AI-powered chatbot , to AI to devops and security. Last year’s event was the first in-person Cloud Next since 2019, and Google took to the stage to show off its ongoing dedication to AI with its Duet AI for Gmail and many other debuts , including expansion of generative AI to its security product line and other enterprise-focused updates and debuts .

Don’t have time to watch the full archive of Google’s keynote event ? That’s OK; we’ve summed up the most important parts of the event below, with additional details from the TechCrunch team on the ground at the event. And Tuesday’s updates weren’t the only things Google made available to non-attendees — Wednesday’s developer-focused stream started at 10:30 a.m. PT .

Google Vids

Leveraging AI to help customers develop creative content is something Big Tech is looking for, and Tuesday, Google introduced its version. Google Vids, a new AI-fueled video creation tool , is the latest feature added to the Google Workspace.

Here’s how it works: Google claims users can make videos alongside other Workspace tools like Docs and Sheets. The editing, writing and production is all there. You also can collaborate with colleagues in real time within Google Vids. Read more

Gemini Code Assist

After reading about Google’s new Gemini Code Assist , an enterprise-focused AI code completion and assistance tool, you may be asking yourself if that sounds familiar. And you would be correct. TechCrunch Senior Editor Frederic Lardinois writes that “Google previously offered a similar service under the now-defunct Duet AI branding.” Then Gemini came along. Code Assist is a direct competitor to GitHub’s Copilot Enterprise. Here’s why

And to put Gemini Code Assist into context, Alex Wilhelm breaks down its competition with Copilot, and its potential risks and benefits to developers, in the latest TechCrunch Minute episode.

Google Workspace

Image Credits: Google

Among the new features are voice prompts to kick off the AI-based “Help me write” feature in Gmail while on the go . Another one for Gmail includes a way to instantly turn rough email drafts into a more polished email. Over on Sheets, you can send out a customizable alert when a certain field changes. Meanwhile, a new set of templates make starting a new spreadsheet easier. For the Doc lovers, there is support for tabs now. This is good because, according to the company, you can “organize information in a single document instead of linking to multiple documents or searching through Drive.” Of course, subscribers get the goodies first. Read more

Google also seems to have plans to monetize two of its new AI features for the Google Workspace productivity suite. This will look like $10/month/user add-on packages. One will be for the new AI meetings and messaging add-on that takes notes for you, provides meeting summaries and translates content into 69 languages. The other is for the introduced AI security package, which helps admins keep Google Workspace content more secure. Read more

In February, Google announced an image generator built into Gemini, Google’s AI-powered chatbot. The company pulled it shortly after it was found to be randomly injecting gender and racial diversity into prompts about people. This resulted in some offensive inaccuracies. While we waited for an eventual re-release, Google came out with the enhanced image-generating tool, Imagen 2 . This is inside its Vertex AI developer platform and has more of a focus on enterprise. Imagen 2 is now generally available and comes with some fun new capabilities, including inpainting and outpainting. There’s also what Google’s calling “text-to-live images” where you  can now create short, four-second videos from text prompts, along the lines of AI-powered clip generation tools like Runway ,  Pika  and  Irreverent Labs . Read more

Vertex AI Agent Builder

We can all use a little bit of help, right? Meet Google’s Vertex AI Agent Builder, a new tool to help companies build AI agents.

“Vertex AI Agent Builder allows people to very easily and quickly build conversational agents,” Google Cloud CEO Thomas Kurian said. “You can build and deploy production-ready, generative AI-powered conversational agents and instruct and guide them the same way that you do humans to improve the quality and correctness of answers from models.”

To do this, the company uses a process called “grounding,” where the answers are tied to something considered to be a reliable source. In this case, it’s relying on Google Search (which in reality could or could not be accurate). Read more

Gemini comes to databases

Google calls Gemini in Databases a collection of features that “simplify all aspects of the database journey.” In less jargony language, it’s a bundle of AI-powered, developer-focused tools for Google Cloud customers who are creating, monitoring and migrating app databases. Read more

Google renews its focus on data sovereignty

Image Credits: MirageC / Getty Images

Google has offered cloud sovereignties before, but now it is focused more on partnerships rather than building them out on their own. Read more

Security tools get some AI love

Image Credits: Getty Images

Google jumps on board the productizing generative AI-powered security tool train with a number of new products and features aimed at large companies. Those include Threat Intelligence, which can analyze large portions of potentially malicious code. It also lets users perform natural language searches for ongoing threats or indicators of compromise. Another is Chronicle, Google’s cybersecurity telemetry offering for cloud customers to assist with cybersecurity investigations. The third is the enterprise cybersecurity and risk management suite Security Command Center. Read more

Nvidia’s Blackwell platform

One of the anticipated announcements is Nvidia’s next-generation Blackwell platform coming to Google Cloud in early 2025. Yes, that seems so far away. However, here is what to look forward to: support for the high-performance Nvidia HGX B200 for AI and HPC workloads and GB200 NBL72 for large language model (LLM) training. Oh, and we can reveal that the GB200 servers will be liquid-cooled. Read more

Chrome Enterprise Premium

Meanwhile, Google is expanding its Chrome Enterprise product suite with the launch of Chrome Enterprise Premium . What’s new here is that it mainly pertains mostly to security capabilities of the existing service, based on the insight that browsers are now the endpoints where most of the high-value work inside a company is done. Read more

Gemini 1.5 Pro

Everyone can use a “half” every now and again, and Google obliges with Gemini 1.5 Pro. This, Kyle Wiggers writes, is “Google’s most capable generative AI model,” and is now available in public preview on Vertex AI, Google’s enterprise-focused AI development platform. Here’s what you get for that half: T he amount of context that it can process, which is from 128,000 tokens up to 1 million tokens, where “tokens” refers to subdivided bits of raw data (like the syllables “fan,” “tas” and “tic” in the word “fantastic”). Read more

Open source tools

At Google Cloud Next 2024, the company debuted a number of open source tools primarily aimed at supporting generative AI projects and infrastructure. One is Max Diffusion, which is a collection of reference implementations of various diffusion models that run on XLA, or Accelerated Linear Algebra, devices. Then there is JetStream, a new engine to run generative AI models. The third is MaxTest, a collection of text-generating AI models targeting TPUs and Nvidia GPUs in the cloud. Read more

We don’t know a lot about this one, however, here is what we do know : Google Cloud joins AWS and Azure in announcing its first custom-built Arm processor, dubbed Axion. Frederic Lardinois writes that “based on Arm’s Neoverse 2 designs, Google says its Axion instances offer 30% better performance than other Arm-based instances from competitors like AWS and Microsoft and up to 50% better performance and 60% better energy efficiency than comparable X86-based instances.” Read more

The entire Google Cloud Next keynote

If all of that isn’t enough of an AI and cloud update deluge, you can watch the entire event keynote via the embed below.

Google Cloud Next’s developer keynote

On Wednesday, Google held a separate keynote for developers . They offered a deeper dive into the ins and outs of a number of tools outlined during the Tuesday keynote, including Gemini Cloud Assist, using AI for product recommendations and chat agents, ending with a showcase from Hugging Face. You can check out the full keynote below.