Baby Flat Head Syndrome: Causes, Prevention, Tummy Time & When You Need a Doctor

Dr. Sandip Gupta

A pediatrician explains flat head syndrome (positional plagiocephaly) in babies — why one side of a baby's head becomes flat, how to keep the head round, and when it might be a more serious condition needing medical attention. Covered in this video: Why babies get a flat head Very common in babies under 6 months. A baby's skull bones are soft and not calcified/hard like an adult's — this is because the brain grows extremely fast (reaching about 80% of adult head size by 2 years and about 90% by 5 years), so the skull needs to stay flexible and mouldable to allow this growth. If a baby lies on the same side of the head repeatedly, pressure on that side flattens it — this is called deformational plagiocephaly or flat head syndrome. It is a very common and not a serious problem, and generally resolves gradually over time since the brain grows symmetrically. Premature babies have even softer skulls than full-term babies, so they develop flat head syndrome more easily. Congenital torticollis (a condition where the neck muscle on one side is tighter/stronger, so the baby always tilts the head to one side) can also cause the baby to always sleep on that side, flattening that part of the head. How to prevent flat head — tips for parents Change head position every 3–4 hours: When putting the baby to sleep on the back, tilt the head slightly to alternate sides each time (using a pillow if needed) so pressure doesn't always fall on the same spot. Upright time and holding: Once the baby is over a month old, hold the baby upright on the shoulder for a while instead of always keeping them lying on the bed — during burping, spend 15–20 minutes holding and walking with the baby. This also helps emotional bonding and speech development if you talk or sing to the baby. Tummy time: After the umbilical cord falls off (around the first or second week), give the baby tummy time — laying the baby on the stomach while you sit with them and supervise, never leaving the baby alone. Start with short periods and build up to 15–20 minutes, three times a day, as the baby grows. This takes pressure off the back of the head and helps it stay round. (A separate detailed video on tummy time — when to start, how to do it, and its benefits — is linked in the description; useful for babies under 9 months.) Special pillows: Small-grain pillows, called mustard seed pillows or rai pillows, redistribute pressure across the contact area of the head, helping prevent flattening on any one spot. If the baby's head is already flat Start with positional therapy — don't always sleep the baby on the same side. In consultation with your doctor, tummy time can be increased. Mild to moderate flat head syndrome can generally be corrected gradually with positional therapy, tummy time, and upright holding. If it is severe — flattened beyond a certain level — consult your doctor about helmet therapy, where a specially designed helmet relieves pressure on the flattened side so the brain can grow there and the bone gradually reshapes to round. Positional therapy, tummy time and upright holding should always be tried first before this. Why it takes time The growing brain gradually shapes the skull bone, so correction can take time — sometimes 6 months to a year. As babies reach 1.5 to 2 years and become more active and spend less time lying down, the head often rounds out on its own. Keep consulting your pediatrician and tracking head circumference to monitor head growth. When a flat head could be something more serious — craniosynostosis In craniosynostosis, the baby's head has an abnormal shape from birth, and you can feel a ridge on the skull. The skull bones fuse together too early (with no space between them as there should be), so the brain cannot grow properly. This is a fairly serious condition and often needs surgical therapy so the brain can grow correctly. If your baby's head shape is very abnormal, get it checked by your pediatrician to rule this out. Questions this video answers: Why has my baby's head become flat on one side? What is flat head syndrome / positional plagiocephaly? Is a flat head in a baby serious or dangerous? Why are premature babies more prone to flat head? What is torticollis and how is it related to flat head? How do I prevent my baby from developing a flat head? How often should I change my baby's sleeping head position? What is tummy time and how does it help head shape? When should tummy time start and how long should it last? What is a mustard seed pillow and does it help flat head? My baby already has a flat head — how do I fix it? What is helmet therapy for flat head syndrome? How long does it take for a baby's flat head to become round again? What is craniosynostosis and how is it different from flat head syndrome? When should I see a doctor about my baby's head shape? Relevant for: parents of babies under 2 years, especially those noticing flattening on one side of the baby's head, premature babies' parents, and anyone concerned about head shape or torticollis. Disclaimer: All information and suggestions given in this video are general health information. They are not a substitute for professional medical advice, diagnosis or treatment. Please consult your pediatrician for any concerns about your baby's head shape, growth or possible torticollis or craniosynostosis.