Quick Answer
A cone-shaped head after birth is completely normal and is called moulding. It happens because the bones of a newborn's skull are not yet fused — they are designed to overlap and compress during labour to allow the head to pass through the birth canal. In most cases, the head rounds out naturally within a few days to a few weeks.
Why It Happens
A baby's skull is made up of several separate bone plates connected by soft, flexible gaps called sutures and fontanelles (the soft spots). This design allows the skull to compress and reshape during the journey through the birth canal — a process called moulding.
The longer and more difficult the labour, the more pronounced the moulding tends to be. Babies born after a prolonged pushing stage, or with the assistance of forceps or a ventouse (vacuum), may have more noticeable head shaping.
Babies born by planned caesarean section before labour begins typically have rounder heads, as they have not passed through the birth canal.
How Quickly Does It Resolve?
In most cases, moulding resolves on its own within a few days to 2 weeks as the skull bones gradually shift back into a rounder shape. No treatment is needed. Simply holding and feeding your baby normally allows the head to round out naturally.
Other Normal Head Variations at Birth
- Caput succedaneum: Soft, puffy swelling on the scalp caused by pressure during labour. It crosses the suture lines and typically resolves within a few days
- Cephalhaematoma: A firmer lump caused by bleeding between the skull bone and its covering membrane. It does not cross suture lines and may take several weeks to months to fully resolve. It is harmless in most cases but your pediatrician will monitor it
- Fontanelles: The soft spots on your baby's head — one at the front (anterior) and one at the back (posterior) — are normal and allow for continued brain growth. The posterior fontanelle typically closes by 2 to 3 months; the anterior fontanelle by 12 to 18 months
What About Flat Head Syndrome?
Positional plagiocephaly — a flat spot on the back or side of the head — is different from birth moulding and develops after birth, usually from spending extended time in one position. To reduce the risk:
- Give your baby regular supervised tummy time when awake
- Alternate the direction your baby faces in the cot
- Limit time in bouncers, car seats, and swings when not travelling
- Hold your baby upright and vary their position throughout the day
When It's Worth Checking In With Your Pediatrician
Speak to your pediatrician if:
- The cone shape or head asymmetry has not improved after 2 to 3 weeks
- You notice a firm, growing lump on the scalp
- The fontanelle appears sunken (possible dehydration) or bulging when your baby is calm and upright (possible increased pressure)
- You notice a flat spot developing on one side or the back of the head after the first few weeks
- You have any concerns about your baby's head shape or development
Key Takeaway
A cone-shaped head after birth is a normal result of the skull moulding to fit through the birth canal. It resolves on its own within days to weeks and requires no treatment. If you are concerned about the shape of your baby's head at any point, your pediatrician is the best person to assess it.
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This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your pediatrician or a qualified healthcare provider with questions about your baby's health.