Torticollis in Babies: Flat Heads, Head Tilts and Why Starting Early Matters

A baby who always turns their head the same way, or who is developing a flat spot on one side of the head, is showing the two most common reasons babies are referred to physical therapy. Torticollis in babies is common, it is treatable, and it is one of the few areas of pediatric therapy where the evidence on timing is unusually clear.

This article covers what torticollis and a flat spot are, how to tell whether your baby might have them, and why the first weeks matter so much. Our pediatric physical therapy team treats both. For the wider picture, including movement milestones and what a session looks like, see our guide to baby physical therapy.

Why timing matters more here than anywhere else

The clearest data comes from congenital muscular torticollis, the tight neck muscle that produces a persistent head turn preference. The American Physical Therapy Association’s clinical practice guideline, updated in 2024, sets out how outcomes change depending on when therapy starts.

According to the guideline’s summary of the evidence, 99 percent of infants who began treatment before one month of age achieved excellent outcomes, with an average treatment duration of 1.5 months. Starting between one and three months, 89 percent achieved excellent outcomes, taking an average of 5.9 months. Between three and six months, that fell to 62 percent over 7.2 months. Between six and twelve months, it fell to 19 percent over 8.9 months.

Read those numbers again, because they are doing something specific. It is not just that later treatment is less likely to work. It is that later treatment takes longer as well. A family who starts at three weeks is typically finished before a family who starts at four months has properly begun.

The same guideline recommends that clinicians check for neck, facial or cranial asymmetry within the first two days of birth, and refer as soon as asymmetry is noticed. That is a standard many babies never actually get checked against, which is why parents so often end up being the ones who spot it.

What torticollis and a flat spot actually are

These two turn up together often enough that it is worth separating them.

Torticollis, in infants, usually means one of the muscles running down the side of the neck is tighter and shorter than its partner on the other side. The effect is a head that tilts toward the tight side and rotates away from it. Some babies have a palpable thickening in that muscle. Many do not, and the only visible sign is the preference itself.

It is common, it is treatable, and it is not caused by anything a parent did. The usual explanation is position in the womb or during birth, which is why it shows up more often after a breech presentation, a tight fit, or a multiple pregnancy.

A flat spot, or positional plagiocephaly, is what happens when a skull that is still soft rests in the same position for long stretches. It is a consequence of pressure and time rather than of anything structural, which is also why changing pressure and adding time upright is the first line of response.

The link between them is straightforward. A baby who prefers to look one way rests on the same part of the skull, and the flattening follows. Treat the neck early and the pressure redistributes on its own in most cases. Leave the neck and the flattening tends to entrench, because a flattened area is itself more comfortable to rest on, which reinforces the preference that caused it.

That circular quality is the reason the timing evidence above matters so much. Both problems get easier to solve the earlier you interrupt the loop.

Why are flat spots more common than they used to be?

If it seems like more babies have a flat spot than a generation ago, that is not your imagination. Since the early 1990s, parents have been told to put babies to sleep on their backs, because back sleeping sharply reduces the risk of sudden infant death. That advice has saved a great many lives and it is still right.

It also means babies now spend many hours with the back of the head against a mattress, and more time in car seats and carriers that do the same. Positional flattening rose as a result. The answer is not to change how your baby sleeps. It is to make sure the waking hours include plenty of time off the back of the head: on the tummy, upright on your shoulder, and on the floor.

A flat spot on its own, with a neck that turns freely both ways, usually responds to those changes. A flat spot alongside a head preference is the combination that most needs the neck looked at.

How do I spot torticollis in babies?

Only an assessment can tell you for certain, but these are the signs that usually prompt one:

• A tilt. The head leans toward one shoulder, with the chin turned toward the other.
• A favorite side. Your baby looks one way far more than the other, or resists being turned.
• Feeding on one side. One breast, or one side of the bottle, goes noticeably better than the other.
• A flat spot. Flattening at the back or side of the head, sometimes with one ear sitting slightly further forward than the other.
• A small firm lump in the side of the neck in the first weeks, which some babies have and many do not.

One simple check at home: with your baby on their back, call to them from each side in turn and watch how far they turn. It is not a diagnosis, but a difference you can see is worth mentioning.

What does treatment involve?

Mostly three things, and you will be doing a share of each.

Stretching the tight muscle gently, within a range your baby tolerates. Your therapist will show you how and how often, because most of the stretching happens at home, between sessions.

Strengthening the other side through play, so your baby turns toward the stiff side on their own, following a face, a voice or a toy. Active turning does more than any amount of passive stretching.

Changing the routine so it stops feeding the preference: carrying, feeding, sleep position and where things happen in the room.

Sessions are not painful, and a baby who is genuinely distressed is telling the therapist something useful. Progress is usually measured in how far the head turns and tilts, so you should be able to see it change.

How long it takes depends mostly on when you start. The guideline averages run from about six weeks for babies who begin in the first month to around nine months for those who begin after six months. That spread is the practical case for asking early: the same condition, treated at different ages, can mean a few weeks of home routine or most of a year.

What you can do today

None of this replaces an assessment, and all of it is reasonable regardless.

• Alternate everything. Which arm you carry in, which end of the crib the head goes, which side you feed from. Babies orient toward whatever is interesting, so move the interesting thing.
• Give them the other side. If your baby always looks right, put yourself, the light and the toys on the left and let curiosity do the stretching.
• Keep safe sleep safe. Always on the back to sleep. Change which way the head faces, not the sleep position.
• Build tummy time in while awake. Short and frequent, on the floor or on your chest.

When to ask

Ask if you notice a consistent head preference, a tilt, or a developing flat spot. Ask sooner rather than later, because the numbers above are the strongest argument in this article and they all point the same way.

You do not need to have decided anything before you call. Parents often hold off because they are not sure the thing they noticed counts, or because someone has told them to give it another month. A month is a meaningful proportion of the window the evidence describes, and no therapist thinks less of a family for asking about something that turns out to be nothing.

Asking early costs you one appointment. Waiting can cost the weeks when treatment works fastest. If any of this sounds like your baby, tell us what you are seeing and we will help you work out whether they should be seen.

About this article. Written and reviewed by the clinical team at Joy Therapy and Learning Center, a pediatric therapy practice in Cumming, Georgia.

This article is general information and is not a diagnosis or medical advice about your child. If something here sounds familiar, speak to your pediatrician or ask us for an evaluation.