A baby who leans their head to one side may have a tight neck muscle. Here is how to tell, what to do at home, and when to get help.
It is the third evening in a row. You lay your baby down, and their head settles to the right again. You turn it gently to the left, and by the time you have put the kettle on, it has drifted back. Is this just a favourite side, or something you should act on?
Most parents who ask this are doing exactly the right thing by asking. Here is a plain way to work out what you are looking at, and what to do next.
Is it normal for my baby to favour one side?
Yes, babies often have a side they like, and a favourite side is not a diagnosis. What gives it weight is how consistent it is, and whether your baby's neck seems to move easily in both directions. A baby who turns freely to both sides and simply prefers one is a different picture from a baby who keeps the head tilted, or seems unable or unwilling to turn the other way.
You do not need to measure anything. Watch over a day or two: which way does the head rest when your baby is awake, being fed, and lying on their back? Does it move easily to the other side when something interesting appears there? What you notice is the most useful thing you can bring to a doctor or physiotherapist.
What is torticollis, and how would I spot it?
Torticollis, sometimes called "wry neck", is when a baby's head is tilted to one side, usually because a neck muscle on that side is tight. The muscle involved is the sternocleidomastoid, the long one that runs from behind the ear down to the collarbone. A baby with torticollis may also prefer to look only one way, and some have a small soft lump in that muscle, which can settle by itself.
The cause is not always clear. For many babies, it is linked to how they were positioned before birth, and it is common but rarely serious. What matters now is that it is noticed. Left untreated, torticollis can make a flat spot worse and can leave a baby with a head tilt or turn that lasts, so "wait and see" is not a good plan for a tilt that keeps showing up.
Why is the back of my baby's head flat on one side?
A flat spot (positional plagiocephaly) comes from steady pressure on one part of a soft skull. Young babies spend a lot of time on their backs, which is the safest way for them to sleep, and a head that rests the same way again and again can flatten on that side. A tight neck muscle makes this more likely, because the baby cannot easily turn away from the same spot.
Many mild cases ease on their own as a baby starts to turn over and sit up. Even so, it is worth finding out what is behind the flattening, because the right plan depends on the cause. Our physiotherapists can assess this directly, without you needing to see a doctor first, and will talk you through the approach that suits your baby. Moderate cases may be referred on for helmet therapy. Coming in early matters, because a baby's head is easier to reshape while they are young. Flat heads and tilted heads often show up together, which is why they are looked at together.
Which one is it? A quick way to sort what you are seeing
This table is for sorting your observations, not for diagnosing your baby. Only a doctor or physiotherapist who examines your baby can tell you which applies.
| What you notice | What it may point to | A sensible first step |
|---|---|---|
| Head tilts to one side, and your baby prefers to look one way | A tight neck muscle (torticollis) | Book a physiotherapy assessment soon. Do not wait for it to pass. |
| One part of the back of the head looks flatter, but the head turns both ways easily | Positional flattening (plagiocephaly) | Book a physiotherapy assessment to find out what is behind it. Meanwhile, change your baby's head position when they sleep, and give tummy time while they are awake. |
| Both: a tilt or turning preference, and a flat spot | Torticollis with plagiocephaly | A physiotherapist can assess the neck and the head shape together. |
| A tilt together with concerns about your baby's eyes, hearing, or how they use one arm | A cause beyond the neck muscle | Bring it to your paediatrician first, or raise it at your baby's developmental assessment. If the tilt came on suddenly or your baby seems unwell, see a doctor promptly. |
Could it be something other than a tight muscle?
Sometimes, but for most babies a physiotherapist can assess the tilt directly, with no need to see a doctor first. Occasionally a tilted head is a baby's way of working around something else. Hospital guidance lists problems with the eyes (a squint), hearing, the bones of the neck, and injury to the nerves of the arm among the other possible causes. If you notice other concerns like these, bring them to your paediatrician first, or raise them at your baby's developmental assessment. A doctor can examine your baby and, where needed, arrange scans. If it is only the tilt or the flat spot you are worried about, you can come straight to us.
What happens next, and where does physiotherapy fit in?
Hospital guidance is that babies under a year old with torticollis are usually managed with physiotherapy. That means stretching and strengthening work for the neck, guided by a physiotherapist. Surgery is generally reserved for severe cases that have not settled, usually in older children.
At Women & Children Centre, we see both babies and toddlers. Our torticollis and plagiocephaly physiotherapy looks at how your child's head and neck move, checks for a flattened head and other concerns, and shows you play-based exercises and positions that fit into daily life. We also talk through how to position your child for sleep, feeding, and play. Children develop at different paces, so we look at your child, not at a chart, and we will tell you plainly if a doctor's or orthotist's review is required.
What can I safely do at home?
Back to sleep is the general rule for night sleep and all unsupervised naps. Your physiotherapist can go through specific positioning techniques for play and supervised naps with you. Please only do these with a professional's guidance.
While your baby is awake and you are right there, there is plenty you can do:
- Alternate the way your baby's head faces each time you lay them down to sleep, so the pressure is not always in one spot.
- Offer tummy time while your baby is awake, with you right there. Short, frequent sessions count.
- Bring interesting things to the less favoured side: your voice, your face, a soft toy, so that turning that way is rewarding.
- Vary how you carry and feed, so the same side is not always against your arm.
- Ask us to show you any stretches. The right ones depend on which side is tight and how tight, so it is worth learning them from someone who has examined your baby.
If you are wondering whether your baby is on track with rolling and sitting, remember that the range is wide. Our guide to child development milestones explains what is typical and when a conversation with your paediatrician is worthwhile.
Frequently Asked Questions
Will my baby grow out of it?
A mild flat spot often eases once a baby is turning over and sitting up. A tilt linked to a tight muscle is different: untreated, it can worsen the flattening and leave a lasting tilt. That is why it is worth asking early rather than waiting.
Did I cause this?
Very unlikely. The cause is not always clear, and for many babies it relates to how they were positioned before birth. Noticing it and acting is the part that helps.
Can I use a pillow or a wedge to keep the head off the flat spot?
No. Keep the cot clear, lay your baby on their back, and change the head direction between sleeps instead.
Who should I see first?
For most babies, you can come straight to a physiotherapist; you do not need a doctor to look at it first. If you notice other concerns, such as with your baby's eyes, hearing or how they use an arm, speak to your paediatrician first, or bring it up at your baby's developmental assessment. If the tilt came on suddenly or your baby seems unwell, see a doctor promptly. You can book an assessment with us whenever you are ready.
Will physiotherapy hurt my baby?
Torticollis physiotherapy is built around stretching, strengthening and play-based positions, and your physiotherapist will show you what to do at home.
You noticed early, and that counts
Spotting that your baby's head sits a little differently is the first and hardest step. Many parents wait because they do not want to fuss. You are not fussing. A tilt is one of those things where a look from a physiotherapist either settles your mind or gets the right help started while your baby is young and growing fast.
If your baby's head keeps tilting or turning to one side, or you can see a flat spot, book an appointment with our paediatric physiotherapists. You can read more about our torticollis and plagiocephaly service first if you prefer, or our earlier parent's guide to torticollis.
References
- KK Women's and Children's Hospital. Torticollis (patient information). https://www.kkh.com.sg/patient-care/conditions-treatments/torticollis-childhood-illnesses
- KK Women's and Children's Hospital. Singapore's first PlagioCentre@KKH provides specialist treatment for infants with flat head syndrome, 5 December 2025. https://www.kkh.com.sg/news/patient-care/singapore-s-first-plagiocentre-kkh-provides-specialist-treatment
- KK Women's and Children's Hospital. KKH launches Singapore's first PlagioCentre to treat flat head syndrome in infants, 3 June 2025. https://www.kkh.com.sg/news/announcements/kkh-launches-singapore-first-plagiocentre-to-treat-flat-head-syndrome-in-infants
- KK Women's and Children's Hospital. Sleep (patient information). https://www.kkh.com.sg/symptoms-treatments/sleep-growing-up
- HealthHub, Ministry of Health Singapore. Parent Hub: Baby Sleep. https://www.healthhub.sg/programmes/parent-hub/baby-toddler/baby-sleep
- HealthHub, Health Promotion Board. Q&A: How can I get my baby to sleep well and safely? https://www.healthhub.sg/well-being-and-lifestyle/pregnancy-and-infant-health/how-can-i-get-my-baby-to-sleep-well-and-safely
Ready to feel better?
Book a consultation with our physiotherapy team for an assessment tailored to you.