Cone-Shaped Head After Vaginal Birth (Head Molding)
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.
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By Age
What to expect by age
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.
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.
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.
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 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
Sources
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Trust your instincts. If something feels wrong, reach out to your pediatrician.
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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.
My Baby Seems to Use One Side More Than the Other
Babies should use both sides of their body fairly equally during the first 18 months of life. While slight preferences can be normal, a consistent pattern of favoring one side - using one arm much more than the other, crawling with one leg dragging, or turning the head predominantly one way - should always be discussed with your pediatrician. Early identification of asymmetry leads to the best outcomes.
My Baby Only Army Crawls
Army crawling (also called commando crawling) is a completely valid and normal way for babies to move. Many babies army crawl for weeks or even months before transitioning to hands-and-knees crawling, and some skip hands-and-knees crawling entirely. What matters is that your baby is independently mobile and exploring their environment.