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At some point during a bath, a haircut, or a routine checkup, you noticed it: a flat spot on the back or side of your baby's head. Maybe your pediatrician pointed it out. Maybe you've been watching it for weeks, wondering if it's getting worse or if you're imagining things.
You're not imagining things, and you're not overreacting. Plagiocephaly (flat head syndrome) is one of the most common concerns in the first year of life, and the good news is that in most cases, it's very treatable. Even better news: physical therapy is often the most effective first step.
What Is Plagiocephaly?
Plagiocephaly is the medical term for an asymmetric or flattened shape of a baby's skull. It happens because a baby's skull bones are still soft and malleable in the first year of life. When a baby spends a lot of time with pressure on one area of the head, that area can flatten.
There are a few types:
Positional plagiocephaly. The most common type. One side of the back of the head is flatter than the other, often giving the head a parallelogram shape when viewed from above. This is almost always related to positioning and is not a structural problem with the skull.
Brachycephaly. The entire back of the head is flat, giving the head a wider, shorter shape. This happens when a baby consistently lies on their back without much head turning.
Craniosynostosis. This is rare and fundamentally different. It occurs when the skull bones fuse prematurely, and it requires medical intervention. Your pediatrician can distinguish this from positional plagiocephaly through a physical exam and, if needed, imaging.
The Torticollis Connection
Here's something many parents don't realize: plagiocephaly and torticollis go hand in hand. Studies show that up to 90% of babies with positional plagiocephaly also have some degree of torticollis (tightness in the neck muscles that causes a head-turning preference).
The relationship works like this: if your baby has torticollis, they prefer to turn their head to one side. Because they spend so much time with their head in that position, the skull flattens where it contacts the mattress, car seat, or other surface. The flat spot then makes it even more comfortable for the baby to keep their head in that position, creating a cycle.
This is why treating the torticollis is so critical. If you only address the head shape without addressing the underlying neck tightness, the flat spot is likely to persist or return.
Does My Baby Need a Helmet?
This is the question parents ask most often, and the answer depends on the severity and timing.
When a helmet is typically recommended:
- Moderate to severe asymmetry (usually measured by a specialist using calipers or a 3D scan)
- The baby is in the ideal window for helmet therapy, usually between 4 and 12 months when the skull is still highly moldable
- Positioning strategies and PT have been tried consistently for 2-3 months without adequate improvement
When a helmet usually isn't needed:
- Mild asymmetry that's being addressed with PT and repositioning
- The baby is already showing improvement with conservative treatment
- The baby is older than 12-14 months (the skull becomes less moldable, and helmets are less effective)
The important thing to know: whether or not a helmet is recommended, physical therapy should be part of the plan. A helmet shapes the skull passively, but PT addresses the underlying muscle imbalances and movement patterns that caused the flattening in the first place.
How Pediatric PT Helps
A pediatric PT will address plagiocephaly from multiple angles:
Treating the torticollis. If neck tightness is present (and it almost always is), your PT will work on stretching the tight muscles, strengthening the weaker side, and helping your baby develop equal range of motion in both directions.
Repositioning education. Your PT will teach you specific strategies for how to position your baby during sleep, play, feeding, and carrying to take pressure off the flat spot and encourage head turning in both directions.
Tummy time coaching. Tummy time takes pressure off the back of the skull entirely and builds the neck and core strength your baby needs to move their head freely. Your PT will help you find tummy time positions that work for your baby, even if they protest.
Motor skill development. Babies with plagiocephaly and torticollis sometimes show delays in rolling, sitting, or crawling because of the asymmetry in their movement patterns. Your PT will work on these skills to make sure development stays on track.
Monitoring progress. Your PT will track your baby's head shape, neck range of motion, and motor milestones over time to make sure things are moving in the right direction and adjust the plan if needed.
What You Can Do at Home Starting Today
- Maximize tummy time. As much supervised tummy time as your baby will tolerate. Multiple short sessions throughout the day are great.
- Alternate the direction you lay your baby down. Switch which end of the crib the head goes so your baby naturally turns toward activity in the room.
- Limit time in containers. Car seats, swings, bouncers, and rockers all put pressure on the back of the head. Use them when needed, but prioritize floor time when you're home.
- Change up how you hold and carry your baby. Try holding your baby facing outward, or on their side. Alternate which hip and which arm you use.
- Use visual motivation. Place yourself, toys, or interesting objects on the non-preferred side to encourage your baby to turn their head in the direction they usually avoid.
When to Act
The window for addressing plagiocephaly is time-sensitive. The skull is most moldable in the first 6 months and becomes progressively less so after that. If you've noticed a flat spot, the best time to start is now.
At Coral Care, our pediatric PTs evaluate babies for plagiocephaly and torticollis in your home. We'll measure the asymmetry, assess the neck range of motion, check motor development, and build a plan that fits into your daily routine. If a helmet referral is needed, we'll guide you through that process too.
If you've noticed a flat spot on your baby's head, schedule a free consultation with a Coral Care PT. The sooner treatment starts, the better the outcome.

