Flat head syndrome in babies: prevention and when to seek help
Noticing a flattened patch on your baby's head can feel alarming, but flat head syndrome is common in young babies and, in most cases, it does not affect their brain or development. Understanding why it happens and what you can do in your day-to-day routine makes a real difference to how it progresses.
What is flat head syndrome?
Flat head syndrome is an umbrella term covering two related conditions. Plagiocephaly describes a head that is flattened on one side, which can cause the face and ears to look slightly uneven. Brachycephaly describes a head that is flattened across the back, which may push the skull slightly forward and outward.
A baby's skull is soft in the early months and can change shape when pressure is applied to it repeatedly. Both conditions occur when that pressure is concentrated on one area for prolonged periods. The softness that allows the skull to flatten also allows it to correct itself, especially with some simple changes at home.
Why does it happen?
The most common cause is spending a lot of time lying in the same position, where the back of the head presses against a firm surface such as a mattress, car seat, or pram. Babies who are born prematurely are more likely to develop a flat head because their skull is softer than that of a full-term baby at birth.
Another cause is torticollis, where the muscles on one side of the neck are tighter than the other. This can make a baby consistently turn their head in one direction, concentrating pressure on the same spot. If you notice that your baby's head tilts to one side more often than not, it is worth mentioning to your GP.
How tummy time helps
Supervised tummy time during waking hours is one of the most straightforward ways to reduce pressure on the back of the skull. When a baby lies on their front, the weight shifts away from the area most likely to flatten. It also builds the neck, shoulder, and arm strength your baby needs for rolling and crawling later on.
Start with short sessions of a few minutes several times a day and build up gradually as your baby gets used to it. If your baby dislikes tummy time at first, try lying face-to-face with them on the floor, or placing them on your chest while you recline. Small steps, done consistently, add up.
Repositioning throughout the day
Beyond tummy time, varying your baby's position throughout the day reduces the chance of any single spot receiving too much pressure. Some practical approaches include:
- Alternating which arm you carry and feed your baby in, so they look in different directions.
- Moving toys, mobiles, and light sources to encourage your baby to turn their head to the less favoured side.
- Limiting time spent in prams, car seats, and bouncers to journeys and necessary periods rather than extended stretches of play time.
- Varying the direction you place your baby in the cot, so they are encouraged to look toward the room from different angles.
One important rule: do not change your baby's sleeping position to address a flat head. The NHS is clear that babies should always sleep on their back to reduce the risk of sudden infant death syndrome (SIDS). Repositioning is for waking hours only.
When to speak to a GP
Most cases of flat head syndrome improve on their own with the approaches above, and treatment is not usually needed. However, it is sensible to speak to your GP if you are worried about the shape or size of your baby's head, or if the head consistently tilts to one side. Your GP can assess whether there is an underlying cause such as torticollis and refer you to a physiotherapist if needed.
Physiotherapy can help where tight neck muscles are contributing to the problem, giving babies targeted exercises to improve the range of movement in their neck.
What about helmets and headbands?
You may come across helmets or corrective headbands marketed for flat head syndrome. The NHS notes that there is not enough evidence to show these are effective, and they are not available on the NHS. If you are considering one, discuss it with your GP first rather than purchasing privately without guidance.
For the vast majority of babies, a consistent routine of tummy time, varied positioning during waking hours, and a little patience is all that is needed. Flat head syndrome often gets better within around one to two years.
Frequently asked questions
Is flat head syndrome harmful to my baby's brain?
No. According to the NHS, flat head syndrome does not affect a baby's brain or development. The skull changes shape because of external pressure, but this has no impact on what is happening inside.
How long does flat head syndrome usually last?
The NHS states that flat head syndrome often gets better on its own within around one to two years, particularly when parents use repositioning techniques consistently during the early months.
Can I change my baby's sleeping position to help with a flat head?
No. The NHS is clear that babies should always sleep on their backs to reduce the risk of SIDS. Repositioning to relieve pressure on the skull should only happen during supervised waking time, never during sleep.
Do helmets or headbands work for flat head syndrome?
The NHS notes that there is not enough evidence to show helmets or headbands are effective, and they are not available through the NHS. Speak to your GP before considering any privately purchased device.
When should I see a GP about my baby's head shape?
See your GP if you are concerned about the shape or size of your baby's head, or if their head consistently tilts to one side. Your GP can check whether any further assessment or support is needed, such as a referral to physiotherapy.
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