Cone-Shaped Head After Vaginal Birth (Head Molding)
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, NIH guidelines
Last reviewed:
Your baby's physical development is unique, and concerns about cone-shaped head after vaginal birth (head molding), here is what you need to know.
The short answer
A cone-shaped or elongated head after vaginal birth is very common and completely normal. It is called head molding and occurs because the bones of your baby's skull are not yet fused, allowing them to overlap and shift to fit through the birth canal. Your baby's head will round out naturally within a few days to weeks.
Key takeaways
- A cone-shaped or elongated head after vaginal birth is very common and completely normal. It is called head molding and occurs because the bones of your baby's skull are not yet fused, allowing them to overlap and shift to fit through the birth canal. Your baby's head will round out naturally within a few days to weeks.
- Usually normal when: Cone-shaped or elongated head immediately after vaginal delivery
- Call your doctor if: A ridge or raised hard line running along the top or side of the skull, which could indicate craniosynostosis (premature fusion of skull sutures)
- Varies by age — see the age-by-age breakdown below
“Supervised tummy time is recommended daily from the time the baby comes home from the hospital to help prevent flat head syndrome and to strengthen neck and shoulder muscles.”
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What Parents Should Know
According to AAP, NIH guidelines, a cone-shaped or elongated head after vaginal birth is very common and completely normal. It is called head molding and occurs because the bones of your baby's skull are not yet fused, allowing them to overlap and shift to fit through the birth canal. Your baby's head will round out naturally within a few days to weeks. At 0-1 month, head molding is a normal result of vaginal delivery. The skull bones of a newborn are separated by soft, flexible areas called fontanelles and sutures, which allow the head to change shape during birth. After delivery, you may notice the head appears elongated, pointed, or lopsided. This typically resolves within 24-48 hours to a few weeks as the skull bones settle into their normal position. Babies delivered by cesarean section or who were in breech position may not show molding. Head molding is not harmful and does not affect the brain. It is generally considered normal when cone-shaped or elongated head immediately after vaginal delivery. However, you should contact your pediatrician promptly if a ridge or raised hard line running along the top or side of the skull, which could indicate craniosynostosis (premature fusion of skull sutures).
Normal vs. Concerning
By Age
What to expect by age
0-1 month
Head molding is a normal result of vaginal delivery. The skull bones of a newborn are separated by soft, flexible areas called fontanelles and sutures, which allow the head to change shape during birth. After delivery, you may notice the head appears elongated, pointed, or lopsided. This typically resolves within 24-48 hours to a few weeks as the skull bones settle into their normal position. Babies delivered by cesarean section or who were in breech position may not show molding. Head molding is not harmful and does not affect the brain.
1-3 months
The head should have rounded out from delivery-related molding by now. If the head shape remains asymmetric or flat, it may be due to positional preferences (positional plagiocephaly) rather than birth molding. Alternating head position during sleep and supervised tummy time can help prevent flat spots from developing.
3-6 months
Any birth-related head molding should be fully resolved. If you notice the head shape is asymmetric or flat, this is more likely positional plagiocephaly. Your pediatrician will assess head shape at well-child visits and may recommend repositioning strategies or, in significant cases, a referral for a helmet evaluation.
6-12 months
The head shape should be rounding out. If there are concerns about persistent abnormal head shape, your pediatrician may want to distinguish between positional plagiocephaly and craniosynostosis (premature fusion of skull sutures), which requires different management.
What to Tell Your Pediatrician
- Describe when you first noticed cone-shaped head after vaginal birth (head molding) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if head shape has not improved several weeks after birth.
- Mention if you notice a flat spot developing on one side of the head.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Cone-shaped or elongated head immediately after vaginal delivery
- Head shape that gradually rounds out over the first few days to weeks
- Slight asymmetry that improves with repositioning
- Soft spots (fontanelles) that are flat or slightly concave when baby is calm and upright
- Head shape has not improved several weeks after birth
- You notice a flat spot developing on one side of the head
- The head shape seems to be getting more asymmetric over time
- A ridge or raised hard line running along the top or side of the skull, which could indicate craniosynostosis (premature fusion of skull sutures)
- A bulging or sunken fontanelle, or a head circumference that is growing too rapidly or too slowly
What You Can Do at Home
- Keep track of when you notice cone-shaped head after vaginal birth (head molding) — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that cone-shaped or elongated head immediately after vaginal delivery — this is generally within the range of normal.
- At 0-1 month, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Provide plenty of supervised floor time and tummy time to support your baby's physical development.
- While monitoring at home, seek immediate care if a ridge or raised hard line running along the top or side of the skull, which could indicate craniosynostosis (premature fusion of skull sutures).
Related Conditions
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
I'm Worried About Craniosynostosis
Craniosynostosis occurs when one or more of the fibrous joints (sutures) between a baby's skull bones close prematurely, affecting head growth and shape. It occurs in about 1 in 2,000-2,500 births. While it requires surgical treatment, outcomes are generally excellent when diagnosed and treated early. Not all abnormal head shapes are craniosynostosis - positional plagiocephaly is far more common.
Preventing Flat Spots on Baby's Head (Plagiocephaly)
Flat spots on a baby's head (positional plagiocephaly) are very common because newborn skulls are soft and malleable. Prevention strategies include regular tummy time when awake, alternating head position during sleep, and minimizing time in car seats and bouncers when not traveling. Most mild flat spots improve on their own as baby grows.
Cephalohematoma
Cephalohematoma is a collection of blood between a skull bone and its periosteum (the membrane covering the bone), caused by pressure during delivery. It appears as a firm, raised bump on one side of the baby's head that does not cross suture lines. It is generally harmless and resolves on its own over weeks to months. It does not affect the brain, but the breakdown of blood can contribute to jaundice.
Related Resources
Frequently asked questions
Is cone-shaped head after vaginal birth (head molding) normal?
When should I call the doctor about cone-shaped head after vaginal birth (head molding)?
When is cone-shaped head after vaginal birth (head molding) normal?
What causes cone-shaped head after vaginal birth (head molding)?
What should I mention to my pediatrician about cone-shaped head after vaginal birth (head molding)?
Is cone-shaped head after vaginal birth (head molding) normal at 0-1 month?
Is cone-shaped head after vaginal birth (head molding) normal at 1-3 months?
Should I go to the ER for cone-shaped head after vaginal birth (head molding)?
Does cone-shaped head after vaginal birth (head molding) go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Cone-Shaped Head After Vaginal Birth (Head Molding).
Things to mention
- Describe when you first noticed cone-shaped head after vaginal birth (head molding) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if head shape has not improved several weeks after birth.
- Mention if you notice a flat spot developing on one side of the head.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Head shape has not improved several weeks after birth
- You notice a flat spot developing on one side of the head
- The head shape seems to be getting more asymmetric over time
Urgent signs to report immediately
- A ridge or raised hard line running along the top or side of the skull, which could indicate craniosynostosis (premature fusion of skull sutures)
- A bulging or sunken fontanelle, or a head circumference that is growing too rapidly or too slowly
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of cone-shaped head after vaginal birth (head molding) are normal. Talk to your pediatrician if a ridge or raised hard line running along the top or side of the skull, which could indicate craniosynostosis (premature fusion of skull sutures).
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Physical Concerns
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
I'm Worried About Craniosynostosis
Craniosynostosis occurs when one or more of the fibrous joints (sutures) between a baby's skull bones close prematurely, affecting head growth and shape. It occurs in about 1 in 2,000-2,500 births. While it requires surgical treatment, outcomes are generally excellent when diagnosed and treated early. Not all abnormal head shapes are craniosynostosis - positional plagiocephaly is far more common.
Preventing Flat Spots on Baby's Head (Plagiocephaly)
Flat spots on a baby's head (positional plagiocephaly) are very common because newborn skulls are soft and malleable. Prevention strategies include regular tummy time when awake, alternating head position during sleep, and minimizing time in car seats and bouncers when not traveling. Most mild flat spots improve on their own as baby grows.
Cephalohematoma
Cephalohematoma is a collection of blood between a skull bone and its periosteum (the membrane covering the bone), caused by pressure during delivery. It appears as a firm, raised bump on one side of the baby's head that does not cross suture lines. It is generally harmless and resolves on its own over weeks to months. It does not affect the brain, but the breakdown of blood can contribute to jaundice.
Should I Use Adjusted Age for My Preemie's Milestones?
Yes — for premature babies, developmental milestones should be assessed using adjusted (corrected) age, not chronological age, until at least 2 years of age. Adjusted age is calculated by subtracting the number of weeks your baby was born early from their actual age. For example, a 6-month-old born 2 months early would have an adjusted age of 4 months, and should be assessed against 4-month milestones. Most pediatricians use adjusted age for developmental assessment through age 2-3, and for growth charts through age 2.
Baby-Proofing a Small Apartment
Baby-proofing a small apartment is absolutely possible and focuses on the same key safety principles as any home: securing furniture to walls, covering outlets, locking cabinets with hazardous materials, and ensuring safe sleep spaces. Small spaces actually have an advantage - there is less area to monitor. Focus on eliminating the most dangerous hazards first: falls, poisoning, choking, and burns.