Plagiocephaly (flat head): helmet or monitoring?
Reviewed on July 17, 2026
Noticing that your baby's head is flattened on one side often worries parents, but in most cases it is a benign, treatable condition called positional plagiocephaly. It does not affect the brain or development and tends to improve with simple measures. Here we explain why it happens, when monitoring is enough, and when a helmet may be considered, so you can decide with peace of mind.
What positional plagiocephaly is
Positional plagiocephaly is a flattening of part of the baby's head caused by repeated pressure on the same area, usually from spending a lot of time lying in the same position. A baby's skull is soft in the first months, which makes these shape changes common.
It is important to distinguish it from craniosynostosis, in which a skull suture closes early. Positional plagiocephaly does not involve suture fusion and does not affect brain growth.
Why it happens and how to prevent it
Factors such as always sleeping on the back in the same position, torticollis (difficulty turning the neck to one side), and spending long periods in baby seats can contribute. Sleeping on the back is essential for safe sleep, so prevention comes from other measures during the day.
Alternating the head position, offering supervised tummy time while the baby is awake, and encouraging the baby to look to both sides help distribute pressure and favor a more symmetrical shape.
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Request a second opinionMonitoring or a helmet?
In most cases, repositioning measures and, when torticollis is present, physical therapy are enough, and the shape improves with growth. Regular follow-up allows this progress to be observed.
A molding helmet may be considered in moderate to marked cases that do not improve with initial measures, usually within a specific age window. The decision is individual and takes into account severity, age, and the response to measures already tried.
Why a second opinion helps
Parents often hesitate between simply monitoring or investing in a helmet, which requires prolonged use and has a cost. It is also essential to confirm that this is not craniosynostosis, which is managed differently.
An independent second opinion helps clarify the diagnosis, review the head measurements, and assess whether a helmet is truly indicated. This avoids both unnecessary treatment and delays in conditions that require a different approach.
Frequently asked questions
Does positional plagiocephaly affect the baby's brain?
No. Positional plagiocephaly is a skull-shape issue and does not affect brain growth or development. Still, it is worth confirming the diagnosis to rule out craniosynostosis, which is different.
Is a helmet always necessary?
No. Many cases improve with repositioning alone and, when torticollis is present, physical therapy. A helmet is reserved for selected cases that do not respond to initial measures, within an appropriate age window.
How do I request a second opinion about my baby's head?
On Revidra you upload photos, measurements, and imaging exams when available through the platform and receive a written, structured opinion from an independent specialist, helping to confirm the diagnosis and the plan.
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