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Flat head syndrome: does it go away, and what can you do?

Last verified: July 18, 2026

Illustration of a baby's head seen from above with a soft rounded outline

The short answer: some babies develop a flat spot on their head in the first months because they spend a lot of time lying down. It looks worrying, but it does not affect the brain or development, and it usually corrects itself in around 1 to 2 years as your baby grows and sits up more. You can help it along with awake-time position changes. You should not change how your baby sleeps: back sleeping stays.

What flat head syndrome looks like

There are two common patterns, and the NHS names them both:

  • Plagiocephaly: the head is flat on one side. It may look uneven, and the ears may not line up.
  • Brachycephaly: the head is flat at the back. It may look wide, and the forehead may bulge outwards (NHS: Flat head syndrome).

Here is the sentence to hold onto at 3am: apart from affecting how the head looks, flat head syndrome does not cause any other symptoms, and it does not affect your baby’s brain or development (NHS).

Why it happens

A baby’s skull is soft, and it can change shape when pressure sits on the same spot for long stretches. That happens with lots of time sleeping with the back or side of the head against the mattress, or when tight neck muscles (a condition called torticollis) make a baby rest their head on the same side every time (NHS).

Some babies are born with a flat head, which can happen with premature birth and is usually nothing to worry about. Since back sleeping became the standard advice, flat spots have become a common trade-off, and the American Academy of Pediatrics is direct about the math: back sleeping protects against SIDS, and the flat spot usually rounds out as babies grow older and sit up (AAP: Back to Sleep, Tummy to Play).

What actually helps

The fixes all happen during awake time. Both the NHS and AAP recommend the same core moves:

  • More supervised tummy time. Give your baby plenty of awake time on their tummy during the day, and never leave them alone in that position. Our tummy time guide has a full routine, including what to do if your baby hates it.
  • Alternate which end of the cot you place your baby’s feet. Babies naturally turn toward light and interesting things, so switching ends changes which side of the head takes the pressure (AAP).
  • Move the toys and mobiles. Changing where they hang encourages your baby to turn their head the other way (NHS).
  • Vary the side you feed and carry your baby. Breastfed babies switch sides naturally during feeds. If you bottle feed, swap arms partway through (AAP).
  • Limit time in car seats, swings, and bouncy chairs. All of these press on the back of the head. Take your baby out of the car seat as soon as you arrive (NHS; AAP).
  • More time in your arms. Holding your baby, and floor play on both tummy and back, all take pressure off the skull (AAP).

One thing you should not do: change your baby’s sleeping position. Babies should always sleep on their back to reduce the risk of SIDS (NHS). A flat spot is cosmetic and temporary. SIDS risk is not.

What about helmets?

Helmets and headbands are not available on the NHS to treat flat head syndrome, because there is not enough evidence to show they work (NHS). Treatment is usually not needed at all. If your baby has tight neck muscles, they may be referred for physiotherapy, and the physiotherapist will show you gentle exercises to do at home.

When to see a GP

The NHS says to see a GP if:

  • you are concerned about the shape or size of your baby’s head
  • your baby’s head is always tilted to one side, or they have difficulty turning their head (NHS)

The second one matters because it can point to torticollis, which is treatable, and the earlier a flat spot is spotted, the easier it is to stop it getting worse. Rarely, a baby born with an unusual head shape can have a condition called craniosynostosis, where the skull plates fuse early, which is one more reason a GP check is worth it if something looks off to you. Your own concern is reason enough to ask.

Keep reading

Sources

Peanutbean provides general information for educational purposes only. It is not medical advice. Every baby develops at their own pace. Always talk to your pediatrician about your child’s health.

Common questions

Does flat head syndrome go away on its own?

Usually, yes. It often improves over 1 to 2 years as your baby's head grows and they spend less time lying on their back. The AAP notes it typically rounds out as babies grow older and start sitting up. It does not affect the brain or development.

Should I stop putting my baby on their back to sleep if they are getting a flat spot?

No. Babies should always sleep on their backs to reduce the risk of sudden infant death syndrome (SIDS). Work on the flat spot during awake time instead: more supervised tummy time, varying positions, and less time in car seats and swings.

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Peanutbean provides general information for educational purposes only. It is not medical advice. Every baby develops at their own pace. Always talk to your pediatrician about your child's health.