Why does my baby always turn their head to one side?

That matters because most parents are told to look for a head tilt, and a tilt is a late sign. Gary Rogers, a craniofacial surgeon at Children's National Hospital, found head rotation discrepancy to be a more reliable and earlier indicator of congenital muscular torticollis than head tilt.¹ His position is that a preferred head position should be treated as a cervical imbalance until proven otherwise, rather than assumed to be a habit. Whether that is what is going on with your baby is a question for a paediatric physiotherapist, child and family health nurse or GP.

If you have been trying to shift a head preference by rearranging the room and it has not worked, that is not a failure of effort. Rogers notes attempts to change the environment are almost invariably unsuccessful, because the preference comes from the neck rather than the cot.

Congenital muscular torticollis is an imbalance in the neck muscles, mainly the sternocleidomastoid, the long muscle running from behind the ear down to the collarbone. One side is short and tight, and the one on the opposite side is relatively long and weak.

It develops before birth. When a baby's head is held rotated and tilted in the womb for long enough, one sternocleidomastoid shortens and the other lengthens. The Royal Children's Hospital puts the incidence at roughly 3 to 20 per 1,000 births.⁷

The Royal Children's Hospital clinical guideline recognises three forms.⁶ There is muscular torticollis, where the muscle is tight and passive neck movement is restricted. There is muscular torticollis with a mass, where a firm lump can be felt in the muscle. And there is postural torticollis, where a baby has a clear preferred head posture with no muscle tightness and no restriction on movement at all.

That third form is worth holding on to. A baby can have torticollis without a tight neck and without an obvious tilt. The only outward sign may be that they always look the same way.

None of these is a diagnosis. They are the things worth raising at an appointment.

• A head position preference. Your baby returns to the same side no matter how you position them. This is the earliest sign and the one most often dismissed.
• Restricted turning. The Royal Children's Hospital describes the normal range as the chin passing the shoulder when the head is turned, and the ear reaching the shoulder when the head is tipped sideways.⁶ If one direction stops noticeably short of the other, mention it.
• A head tilt. The head leans toward one shoulder while the chin points toward the other. This usually appears later than the rotation preference, around three to four months.
• A firm lump in the neck muscle. Some babies with torticollis have one. You do not need to go looking for it, because feeling for it is part of a clinical examination rather than something to do at home. If you have already noticed one, mention it.
• Feeding on one side is harder. Your baby latches easily on one side and fusses on the other, because turning that way is uncomfortable.
• A flat spot developing. Flattening on one side of the back of the head, often the right.
• Difficulty with tummy time. A baby who cannot turn their head easily finds tummy time harder, and protests more.

One of the signs above, a flat spot developing, comes from your baby resting on the same part of their head for long stretches. The Perfect Noggin is a contoured head shaping surface that redistributes that pressure away from flat spots, used alongside your physiotherapist’s work on the neck itself.

This is the part that is rarely explained well, and it changes what a good assessment looks like. Before roughly three to four months, your baby's head is resting on a surface most of the time. The neck muscles are barely being asked to do anything, so an imbalance can be almost invisible. Once your baby starts holding their own head up against gravity, it shows.

Here is the twist. Rogers found that the tight muscle usually stretches out by around four to five months, while the weak muscle on the other side takes considerably longer to build strength.¹ So a tilt that appears at five or six months is often not tightness on the side of the tilt at all. It is weakness on the opposite side. He also notes this kind of tilt tends to come and go, showing up most when a baby is tired or concentrating on something else, whereas a genuinely contracted muscle produces a consistent tilt and a clear restriction in turning.

That is exactly why a paediatric physiotherapy assessment is worth pushing for rather than working from a video you found online.

Fenton and Gaetani report congenital muscular torticollis in 70 to 95 per cent of infants with deformational plagiocephaly.¹² If your baby has a flat spot, the neck is the first place to look.

The link runs in a specific direction. A baby who can only comfortably turn one way rests on the same part of their skull for months, and that steady pressure produces the flattening. The Royal Children's Hospital notes head shape typically improves once the torticollis itself is treated.⁸ Treating the neck removes what is holding the head in one position, so the flattening stops getting worse. It does not push the flat area back out, which is why head shape has its own timeline alongside the neck. The four-point check covers what that flattening looks like.

There is also a reason so many flat spots appear on the right. Most babies sit in the womb with the head turned to the right, so that is the side they tend to rest on, and Rogers notes nearly every major study has found more right-sided flattening.¹

One caution about how often torticollis gets picked up. Rogers cites work by Pivar and Scheuerle finding that reported rates of torticollis in babies with flat head ranged from 5 per cent to 67 per cent across 18 treatment centres in Texas, and concluding this reflected differences in clinician training rather than differences in the babies.³ So if the neck has not been specifically assessed, it has not been ruled out.

Two things to hold at once here. Your baby always sleeps on their back. That is a cornerstone of safe sleep guidance in Australia and it does not change. Red Nose Australia advises against pillows in the cot, and against products that restrict a baby's movement or hold the head in position.¹¹ The Royal Children's Hospital similarly advises against using a pillow during sleep to prevent or manage flattening, because of the risk of sudden infant death syndrome.⁸

Within that, there is plenty you can change. Alternate which end of the cot you lay your baby down at, so the interesting side of the room is on their less-preferred side. Alternate which arm you feed from. Vary how you carry them. Approach the cot from the side they turn away from. Every one of those gives your baby a reason to turn the way they find harder. None of it replaces an assessment, though. These changes sit alongside a physiotherapy plan rather than instead of one, so they are worth doing while you wait for the appointment rather than instead of booking it.

Supervised tummy time while your baby is awake is the other half of it. The Royal Children's Hospital links limited prone time to slower early motor milestones in babies with torticollis, and also notes those delays resolve by preschool age.⁶ It is a reason to keep tummy time going, not a reason to panic about it. If tummy time is a fight, that is worth raising with your physio rather than a reason to give up on it.

Start with your child and family health nurse or GP. The Royal Children's Hospital pathway begins with positioning advice, supervised prone play and a specific stretching programme, with a review in about four weeks.⁶

Referral to a paediatric physiotherapist is indicated when there is no improvement after four to six weeks, when the restriction is severe at diagnosis, when a baby is older than three months when it is picked up and has more than minimal symptoms, or when there is moderate to severe flattening alongside it. If your baby fits any of those, ask for the referral by name.

A few things a good assessment covers that parents do not expect. Routine neck imaging is not recommended, so you do not need to push for scans. The hips are checked too, because developmental dysplasia of the hip is a common association. The examination should also cover head shape, the skull sutures, eye movements and general neurological development, because other conditions can look like torticollis from the outside.

Some presentations need medical assessment rather than a physio referral. Torticollis that comes on suddenly in a baby who was previously fine, or that is first noticed after six months of age, is uncommon and should be looked at promptly rather than watched.

The same applies to head shape. Most flattening in babies is positional, and how much any individual baby's head changes on its own is not something anyone can predict in advance. Some head shape differences are not positional, and those need medical assessment.

This is part of why a good examination includes checking the skull sutures, and the Royal Children's Hospital advises urgent referral to a craniofacial service if craniosynostosis is suspected.⁸ When to seek medical assessment for your baby's head shape covers this in full.

Most cases do settle. The Royal Children's Hospital clinical guideline notes the majority resolve after four to five months⁶, and its orthopaedic team notes outcomes are better when physiotherapy starts before the baby is three months old.⁷ Both of those are true at once, and read together they point one way. The window where physiotherapy does the most good closes before the window where most cases settle opens, so a side preference is a reason to book an assessment now rather than spend another month waiting to see.

If there has been no significant improvement by around six months, the guidance is to revisit the diagnosis or refer on. Surgical lengthening is only considered where the condition persists past twelve months despite physiotherapy. That is a small minority of babies.

Perfect Noggin is not a treatment for torticollis. Torticollis is a neck problem, and the neck is the physiotherapist's job.

What Perfect Noggin addresses is what torticollis tends to cause. A baby who favours one side rests their head in the same position for long stretches, and it is that sustained pressure on one spot that flattens the skull. Perfect Noggin is a firm, contoured head shaping surface that supports the head and neck in neutral alignment so pressure is spread rather than concentrated in one place. It is a single integrated unit, with nothing loose added to the cot, and your baby's head stays free to turn.

So the two work on different problems at the same time. The physiotherapist works on the neck. Perfect Noggin works on where the head rests while that is happening. It suits babies under six months who have not yet started rolling, and it is used alongside physiotherapy rather than instead of it. Every option used in Australia is compared here.