My Baby's Head Shape Looks Abnormal
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published AAP, AAP, Mayo Clinic guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect head shape looks abnormal, here is what the evidence says.
The short answer
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.
Key takeaways
- 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.
- Usually normal when: A cone-shaped head after vaginal delivery that rounds out within the first 1-2 weeks
- Call your doctor if: You notice a prominent ridge along a skull suture line, the soft spot is bulging or completely absent, or the head shape is changing rapidly, as these can be signs of craniosynostosis requiring surgical evaluation
- Varies by age — see the age-by-age breakdown below
“Fever itself is not an illness — rather, it is a sign or symptom that the body is fighting an infection. Fever stimulates certain defenses, such as the white blood cells, which attack and destroy invading bacteria.”
Parents everywhere have the same worry. You are doing the right thing by looking into it.
What Parents Should Know
According to AAP, Mayo Clinic guidelines, 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. At 0-2 weeks, after vaginal delivery, many babies have a temporarily elongated or cone-shaped head (molding) from passing through the birth canal. This is completely normal and typically resolves within a few days to 2 weeks. Babies may also have a caput succedaneum (soft scalp swelling) or cephalohematoma (firm bump from bleeding between the skull bone and its covering), both of which resolve on their own, though a cephalohematoma may take weeks to months. Babies born via cesarean section often have a rounder head shape. It is generally considered normal when a cone-shaped head after vaginal delivery that rounds out within the first 1-2 weeks. However, you should contact your pediatrician promptly if you notice a prominent ridge along a skull suture line, the soft spot is bulging or completely absent, or the head shape is changing rapidly, as these can be signs of craniosynostosis requiring surgical evaluation.
Normal vs. Concerning
By Age
What to expect by age
0-2 weeks
After vaginal delivery, many babies have a temporarily elongated or cone-shaped head (molding) from passing through the birth canal. This is completely normal and typically resolves within a few days to 2 weeks. Babies may also have a caput succedaneum (soft scalp swelling) or cephalohematoma (firm bump from bleeding between the skull bone and its covering), both of which resolve on their own, though a cephalohematoma may take weeks to months. Babies born via cesarean section often have a rounder head shape.
2 weeks - 4 months
This is when positional plagiocephaly (flat spot) most commonly develops, as babies spend a lot of time on their backs for safe sleep. It is the most common cause of abnormal head shape and affects up to 47% of infants. It can also be associated with torticollis (a tight neck muscle causing the head to tilt to one side). Prevention and treatment include alternating which end of the crib you place the baby's head, supervised tummy time when awake, and varying the direction you hold the baby during feeds.
4-8 months
Mild positional flattening often improves significantly once babies spend more time upright, begin rolling, and have more tummy time. If the asymmetry is moderate to severe and not improving, your pediatrician may refer you to a specialist who may recommend a cranial molding helmet (orthotic). Helmets are most effective when started between 4-6 months, before the skull bones begin to harden. Your doctor will also want to confirm the flattening is positional and not caused by craniosynostosis.
8 months+
By 8-12 months, skull growth slows and the bones become firmer. Mild residual asymmetry is common and is usually covered by hair. Most positional plagiocephaly has minimal long-term cosmetic impact. However, any new or worsening head shape abnormality at this age, or a raised ridge along a skull suture line, should be evaluated by your pediatrician to rule out late-presenting craniosynostosis.
What to Tell Your Pediatrician
- Describe when you first noticed head shape looks abnormal and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you notice a flat spot that seems to be getting worse despite repositioning and tummy time.
- Mention if your baby strongly prefers to turn their head to one side or has a persistent head tilt (possible torticollis).
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- A cone-shaped head after vaginal delivery that rounds out within the first 1-2 weeks
- Mild flattening on one side or the back of the head in a baby who sleeps on their back, which improves with repositioning and tummy time
- The soft spots (fontanelles) are flat and the head is growing along its expected curve
- Your baby moves their head freely in both directions with no persistent head tilt
- You notice a flat spot that seems to be getting worse despite repositioning and tummy time
- Your baby strongly prefers to turn their head to one side or has a persistent head tilt (possible torticollis)
- You feel a raised bony ridge along any part of the skull
- You notice a prominent ridge along a skull suture line, the soft spot is bulging or completely absent, or the head shape is changing rapidly, as these can be signs of craniosynostosis requiring surgical evaluation
- Your baby's head circumference is crossing percentile lines rapidly (too fast or too slow), or you notice forehead bulging, sunset eyes, or persistent vomiting along with head shape changes
What You Can Do at Home
- Keep track of when you notice head shape looks abnormal — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that a cone-shaped head after vaginal delivery that rounds out within the first 1-2 weeks — this is generally within the range of normal.
- At 0-2 weeks, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
- While monitoring at home, seek immediate care if you notice a prominent ridge along a skull suture line, the soft spot is bulging or completely absent, or the head shape is changing rapidly, as these can be signs of craniosynostosis requiring surgical evaluation.
Related Resources
Frequently asked questions
Is head shape looks abnormal normal?
When should I call the doctor about head shape looks abnormal?
When is head shape looks abnormal normal?
What causes head shape looks abnormal?
What should I mention to my pediatrician about head shape looks abnormal?
Is head shape looks abnormal normal at 0-2 weeks?
Is head shape looks abnormal normal at 2 weeks - 4 months?
Should I go to the ER for head shape looks abnormal?
Does head shape looks abnormal go away on its own?
References
- [1]HealthyChildren.org. Baby's Head Shape: Causes and Treatment. AAP
- [2]Laughlin J, et al. Prevention and Management of Positional Skull Deformities in Infants. Pediatrics, 2011. AAP
- [3]Mayo Clinic. Plagiocephaly: Flat Head Syndrome. Mayo Clinic
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss My Baby's Head Shape Looks Abnormal.
Things to mention
- Describe when you first noticed head shape looks abnormal and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you notice a flat spot that seems to be getting worse despite repositioning and tummy time.
- Mention if your baby strongly prefers to turn their head to one side or has a persistent head tilt (possible torticollis).
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- You notice a flat spot that seems to be getting worse despite repositioning and tummy time
- Your baby strongly prefers to turn their head to one side or has a persistent head tilt (possible torticollis)
- You feel a raised bony ridge along any part of the skull
Urgent signs to report immediately
- You notice a prominent ridge along a skull suture line, the soft spot is bulging or completely absent, or the head shape is changing rapidly, as these can be signs of craniosynostosis requiring surgical evaluation
- Your baby's head circumference is crossing percentile lines rapidly (too fast or too slow), or you notice forehead bulging, sunset eyes, or persistent vomiting along with head shape changes
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 head shape looks abnormal are normal. Talk to your pediatrician if you notice a prominent ridge along a skull suture line, the soft spot is bulging or completely absent, or the head shape is changing rapidly, as these can be signs of craniosynostosis requiring surgical evaluation.
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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