Repositioning Techniques for Flat Head Syndrome in Babies

Flat head syndrome — medically known as positional plagiocephaly (asymmetric flattening) or brachycephaly (symmetric flattening of the back of the head) — is common in babies, with estimates suggesting it affects around 20–50% of infants to some degree. The good news is that in the majority of cases it improves naturally with growth and development, and repositioning strategies during the first months of life can significantly reduce or prevent significant flattening.

Why Flat Head Syndrome Happens

A newborn's skull is made up of several plates of bone that are not yet fused, connected by flexible fibrous tissue called sutures. This flexibility allows the skull to mould during birth and to expand rapidly during the brain's growth in the first year.

The same flexibility that makes this possible also means that sustained pressure on one area of the skull — from lying in the same position repeatedly — can cause that area to flatten over time. The back and sides of the head are the areas most commonly affected.

Key contributing factors:

• Back-sleeping position: Since the Back to Sleep / Safe to Sleep campaigns (which have dramatically reduced SIDS deaths), babies sleep on their backs. This means the back of the head is in contact with the mattress for many hours each day.
• Torticollis: A tightness or shortening of the sternocleidomastoid muscle on one side of the neck (torticollis) causes a baby to preferentially turn their head to one side, creating repeated pressure on one part of the skull. Torticollis is a significant contributing factor and should be treated separately if identified.
• Premature birth: Premature babies spend more time in incubators with prolonged positioning and have softer skulls.
• Multiple births: Restricted space in the womb and prolonged engagement in the birth canal increase risk.
• Time in bouncers, car seats, and other reclined positions: Time spent in any position where the head rests against a surface increases the total amount of skull pressure.

Safe Sleep Remains the Priority

Before discussing repositioning, it is essential to be clear: safe sleep guidance requires babies to be placed on their back to sleep. Repositioning strategies are for awake, supervised time — not for altering sleep position. Do not place a young baby on their side or tummy to sleep, as this significantly increases the risk of Sudden Infant Death Syndrome (SIDS).

The goal of repositioning is to maximise the time the skull is free from sustained pressure during waking hours, and to vary the direction of head turning during sleep within safe parameters.

Tummy Time

Tummy time is the single most effective repositioning strategy. When your baby is awake and supervised, placing them on their tummy ensures that no pressure is applied to the back or sides of the head at all, and simultaneously provides the motor challenge that builds the neck, shoulder, and core strength needed for later development.

Starting early: Begin tummy time as soon as you are home from hospital. Even in the first days of life, brief (1–2 minute) tummy time sessions are appropriate and beneficial.

Building up gradually: As your baby gains strength and tolerance, increase session length and frequency. Aim for a total of 30 minutes of tummy time per day by 2–3 months.

Making tummy time tolerable: Many babies initially resist tummy time because they lack the strength to lift their head comfortably. Strategies to make it more acceptable include:

• Tummy-to-chest: lay your baby face down on your chest whilst you recline
• Roll of towel under the chest: a small rolled towel under the chest raises the upper body slightly, making head lifting less effortful
• Eye-level engagement: get on the floor at your baby's eye level and talk, sing, or use a mirror to motivate them to lift their head
• Tummy time on the move: carrying your baby in a "football hold" (face down along your forearm) provides the same skull-offloading benefits

Varying Head Position During Sleep

Whilst changing sleep position is not recommended, you can vary which way your baby naturally turns their head during back-sleeping.

Alternate the direction your baby's feet point in the cot: Babies tend to look toward light, sound, and activity. By alternating which end of the cot your baby's feet are at night by night, you encourage them to turn their head in different directions to look toward the interesting stimuli in the room.

Vary your own position when approaching the cot: If you always approach from the same side (naturally, since that may be the side closest to your bed), your baby will always turn toward you. Consciously vary which side you approach from.

Use sound and visual interest on the less-preferred side: If torticollis or preference is causing your baby to consistently turn one way, place interesting objects, a mobile, or your voice on the less-preferred side to encourage rotation in the other direction.

Reducing Time in "Container" Positions

The cumulative daily time a baby's head spends in contact with firm surfaces matters. Reducing unnecessary time in car seats, bouncers, swings, and other reclined positions during waking hours reduces this pressure load.

Car seats: Use only for travel, not as a substitute for a pram or cot between journeys.

Bouncers and swings: Limit these to short periods when you need your hands free. The rest of the time, babies benefit more from floor time or being carried.

Baby carriers and slings: Carrying your baby in an ergonomic carrier or sling distributes contact pressure away from the skull entirely and simultaneously provides motor input, warmth, and social interaction. It is one of the most beneficial alternatives to container positions.

Identifying and Treating Torticollis

If your baby consistently turns their head in one direction and resists or cannot easily turn in the other direction, torticollis may be contributing to their head shape. Signs include:

• A persistent tilt of the head to one side
• Difficulty or discomfort when turning the head to one side
• A small, firm lump in the neck muscle on one side (a fibrotic nodule, which is benign)

Torticollis is effectively treated with physiotherapy. A paediatric physiotherapist will teach you gentle stretching exercises to perform at home. Early treatment is important because torticollis-related plagiocephaly will not fully correct unless the underlying muscle tightness is addressed.

Speak to your GP or health visitor if you suspect torticollis.

When to Seek Professional Advice

You should speak to your health visitor or GP if:

• The flattening is noticeable or worsening despite repositioning from around 2–3 months
• The ear on one side appears more forward than the other (suggesting significant asymmetry)
• Your baby consistently cannot turn their head in one direction
• You are worried at any stage

Most cases of positional plagiocephaly resolve well with repositioning and do not require helmet therapy. However, early referral to a specialist (paediatric physiotherapist, paediatric neurosurgeon, or specialist cranial reshaping service) is appropriate for moderate to severe cases, as the window in which reshaping therapy is most effective is the first year of life.

Helmets and Cranial Bands

Cranial remoulding orthoses (helmets or cranial bands) are available for more significant cases of plagiocephaly that have not responded adequately to repositioning. They work by creating a space for the flattened area to grow into while limiting growth in the already-rounded areas.

In the UK, helmet therapy is not routinely funded by the NHS for positional plagiocephaly, though it is available privately. The evidence for its effectiveness compared to repositioning alone is modest for mild to moderate cases, but stronger for severe cases or those presenting after 6 months when natural remodelling is slowing.

The window of greatest effectiveness is between 4 and 12 months of age; earlier is generally better. If you are considering helmet therapy, seek a referral to a specialist service for a thorough assessment.