You’re gazing at your newborn, and you notice one side of the back of their head looks flatter than the other. Maybe a family member mentioned it, or you spotted it in a photo. Now you’re searching online and wondering: Did I do something wrong? Will it go away?
First, take a breath. Flat head syndrome is very common, it’s not painful, and it doesn’t affect brain growth. In most babies, it’s mild and improves with simple changes. This guide explains what causes it, how to prevent it, when to get help, and how physical therapy fits in.
What Is Flat Head Syndrome?
Flat head syndrome, medically called positional plagiocephaly, is a flattening of part of a baby’s head caused by repeated pressure on the same area. A baby’s skull is soft and flexible, which is important for birth and brain growth. But it also means the head can change shape when a baby spends a lot of time lying in one position.
There are a few common patterns:
- Plagiocephaly: flattening on one side of the back of the head, which can make the head look slightly lopsided, sometimes with one ear or one side of the forehead appearing pushed forward
- Brachycephaly: flattening across the whole back of the head, making it look wide and short
- Scaphocephaly: a long, narrow head shape, more common in premature babies
Positional flattening is a cosmetic and positional issue. It isn’t a brain problem and doesn’t cause developmental delays on its own. However, it can sometimes be a clue to something else, such as neck tightness (more on that below).
Read More: W-Sitting in Children: Is It Bad for Kids?
Why Does It Happen?
Several factors can contribute:
- Sleeping on the back. Back sleeping is the safest position for babies, and it’s what reduces the risk of SIDS. A flat spot is an expected trade-off, and a much safer problem to have. Never put your baby on their stomach to sleep to prevent a flat head.
- Lots of time in containers. Car seats, bouncers, swings, and reclined carriers keep pressure on the back of the head.
- A preference for turning one way. Many babies favor looking to one side, which concentrates pressure on one spot.
- Torticollis. Tight or imbalanced neck muscles can make it hard for a baby to turn their head both ways. This is one of the most important links to physical therapy.
- Limited time on the tummy while awake.
- Being born early. Premature babies have softer skulls and often spend more time lying on their backs.
- Multiples or tight space in the womb, which can start head shaping before birth.
- A difficult or assisted birth.
Signs to Look For
You may notice:
- A flat spot on the back or side of your baby’s head
- One ear sitting further forward than the other when viewed from above
- One side of the forehead looking fuller or more prominent
- Uneven cheeks or a slight facial asymmetry
- Your baby almost always turning their head toward the same side
- Difficulty turning the head the other way, or a head that tilts to one side
A helpful check is to look at your baby’s head from above (the “bird’s-eye view”) while they’re lying on their back, and compare both sides. Your pediatrician can also assess the head shape at routine visits.
Is It Serious?
Most of the time, no. Positional flattening is usually mild and often improves as babies grow, start moving more, and spend less time on their backs, especially once they start rolling and sitting.
However, a flat head can sometimes be confused with craniosynostosis, a different, less common condition where bones in the skull fuse too early. It needs medical evaluation and is not caused by positioning. Signs that call for prompt medical attention include:
- A hard ridge along a skull seam
- A head that is not growing in proportion or looks unusually shaped from the front, back, and top
- A soft spot (fontanelle) that seems to have closed early, or sunken or bulging
- Head shape that is getting worse despite repositioning
- Any developmental concerns, vomiting, extreme sleepiness, or poor feeding
If you’re unsure, ask your pediatrician. They can tell the difference and decide whether any further evaluation is needed.
How to Prevent Flat Head Syndrome
The good news is that most prevention is simple, free, and fits into daily life. The earlier you start, the better, ideally from the first weeks of life.
1. Keep sleep safe, always
Place your baby on their back, on a firm, flat sleep surface with no pillows, bumpers, positioners, or wedges. Do not use sleep positioners or other products marketed to prevent flat spots. They aren’t considered safe for sleep. Follow the American Academy of Pediatrics safe sleep guidelines.
2. Make tummy time a daily habit
Tummy time, when your baby is awake and supervised, takes pressure off the back of the head and builds neck, shoulder, and core strength. Start with a few minutes at a time, several times a day, and build up as your baby tolerates it. You can begin soon after birth. For ideas, see our guide to [tummy time].
If your baby dislikes tummy time, try:
- Lying on your chest while you recline
- Placing your baby across your lap
- Getting down on the floor face to face
- Using a mirror or high-contrast toys
- Short, frequent sessions after diaper changes
3. Change your baby’s head position during the day
- Alternate which end of the crib your baby sleeps at (while keeping them on their back), so they turn to look toward the room from different sides
- Switch sides when feeding. Alternate arms when bottle or breastfeeding.
- Move toys and stimulation to the side your baby doesn’t favor, to encourage turning both ways
Read More: BPPV Vertigo: The Epley Maneuver and When to See a Physical Therapist
4. Limit time in “containers”
Car seats, bouncers, swings, and reclined seats are useful and sometimes necessary, but long stretches in them can keep pressure on the same area. Use them for their intended purpose, such as car rides, and give your baby floor time otherwise. Never let a baby sleep in a car seat, swing, or similar device outside of travel when they can’t be watched.
5. Hold and carry your baby
Upright time in your arms, on your shoulder, or in a safe, well-positioned baby carrier takes pressure off the back of the head and gives your baby different views of the world.
6. Supervised floor play
As your baby grows, give them plenty of time on a clean, safe floor surface to move, roll, and explore.
The Torticollis Connection
If your baby strongly prefers turning their head one way, or tilts their head to one side, tight neck muscles (congenital muscular torticollis) may be involved. Torticollis and flat head syndrome often occur together. A baby who can’t comfortably turn both ways keeps resting on the same spot, which deepens the flattening, and the flattening can in turn make it more comfortable to stay on that side.
This is where physical therapy becomes especially valuable, because it addresses the cause of the preference, not just the flat spot.
How Pediatric Physical Therapy Helps
A pediatric physical therapist doesn’t “reshape the skull.” Instead, therapy helps by treating the movement and positioning factors that drive the flattening, and by giving you a clear, practical plan. An evaluation may look at:
- Neck range of motion in both directions
- Head and neck strength and control
- Muscle tightness or asymmetry
- Preferred head position
- Developmental milestones
- Head shape and how it’s changing, which can be shared with your pediatrician
Depending on what’s found, therapy may include:
- Gentle neck stretching and positioning if tightness or torticollis is present
- Strengthening activities to help your baby turn and hold their head in both directions
- Tummy time coaching with positions that make it more comfortable
- Positioning and handling strategies for sleeping (safely), feeding, playing, and carrying
- Developmental support for rolling, sitting, and crawling, which naturally reduce time on the back
- Parent coaching and a home program since daily routines are where the biggest changes happen
- Coordination with your pediatrician if a medical or specialist referral is needed
Early guidance is helpful. A baby’s head is most changeable in the early months, so it’s worth asking about concerns sooner rather than later.
What About Helmets?
Some babies with moderate to severe flattening may be considered for a cranial remolding helmet (orthosis). Decisions about helmets are made by your pediatrician or a specialist, and depend on factors such as your baby’s age, severity, and whether repositioning has helped. Many babies with mild or moderate flattening improve without a helmet.
If a helmet is recommended, a physical therapist can still help with neck mobility, strength, and development. Ask your doctor to explain the reasons and expected benefits.
When to Talk to Your Pediatrician or Book an Evaluation
Reach out if:
- You see a flat spot or uneven head shape that isn’t improving after a few weeks of repositioning and tummy time
- Your baby always turns to one side or tilts their head
- Your baby has trouble turning their head to one side
- You notice facial asymmetry or one ear looking misaligned
- Your baby dislikes or can’t tolerate tummy time
- Your baby seems behind on milestones such as lifting their head, rolling, or sitting
- You have any concerns about the shape or growth of your baby’s head
Trust your instincts. Raising a question early is always a good idea.
How Care First Rehab Can Help
At Care First Rehab in Cary, NC, our pediatric therapy team supports babies and families with movement, positioning, and developmental concerns. Our care includes:
- A gentle, thorough evaluation of your baby’s neck movement, strength, and development
- A plan tailored to your baby and your family’s daily routine
- Hands-on parent coaching so you know what to do at home
- Coordinated care with your pediatrician and, when appropriate, other specialists
- Support across physical, occupational, and speech therapy if your baby’s needs extend to feeding or other areas
- In-home therapy and telemedicine options for families who need flexibility
- Two convenient locations in Cary
Read More: Hypotonia (Low Muscle Tone) in Babies and Toddlers: Signs, Causes & How Physical Therapy Helps
Frequently Asked Questions
Does flat head syndrome go away on its own?
Many mild cases improve over time as babies become more mobile, especially with regular tummy time and repositioning. Some babies retain a slight asymmetry, which is usually cosmetic. If it isn’t improving, ask your pediatrician.
Is plagiocephaly painful, or does it affect brain development?
Positional flattening is not painful and does not affect brain growth. If your baby has other developmental concerns, those should be evaluated on their own.
Can I use a special pillow or positioner to fix a flat spot?
No. Pillows, wedges, and positioners aren’t safe for sleep and aren’t recommended. Focus on safe sleep, tummy time while awake, and repositioning.
What age is flat head syndrome most noticeable?
It commonly appears in the first few months of life, when babies spend most of their time on their backs. It often improves as they roll, sit, and crawl.
When should I be concerned about my baby’s head shape?
If the flattening is getting worse, if your baby has a hard ridge on the skull, if their head shape looks unusual from several angles, or if there are developmental concerns, see your pediatrician promptly.
Can torticollis cause a flat head?
Yes, they often go together. Tight neck muscles can make a baby favor one side, which leads to flattening. Treating the neck tightness is an important part of improving head shape.
Do all babies with a flat spot need physical therapy?
No. Many babies do well with simple changes at home. Therapy is especially helpful when your baby has neck tightness, a strong head-turning preference, trouble with tummy time, or a flat spot that isn’t improving.
A Little Help Early Can Go a Long Way
A flat spot on your baby’s head is common and usually manageable, and it isn’t a reflection of your parenting. With safe sleep, daily tummy time, simple repositioning, and support when needed, most babies do well.
Call Care First Rehab at 919-460-1921 or [book an evaluation online] to talk with our pediatric therapy team.