Baby Flat Head: Why It Happens and What Helps
A flat spot on a baby’s head is common, and it usually improves as she grows. Her skull is soft, and she spends a lot of time lying on her back, so steady pressure on one spot flattens it. The NHS says flat head syndrome “does not affect their brain or development” and “often gets better in around 1 to 2 years.” What helps is time off the flat spot while she’s awake: supervised tummy time, holding her, and switching sides for feeds and carrying. What doesn’t change is sleep. She still goes down on her back, every time. If her head always tilts one way or she struggles to turn it, ask your pediatrician about a tight neck muscle (torticollis).
Why babies get a flat spot
The NHS explains it simply: “A baby’s skull is soft and can easily change shape,” and it flattens “if pressure is placed on their skull.” Most of the time that pressure comes from “spending a lot of time sleeping with the back or side of their head pressed against the mattress.”
Some head shape quirks are there from day one. Nationwide Children’s Hospital says “it is normal for your baby’s head to be slightly misshaped for a few weeks” after birth, and it can take days or weeks to round out. The NHS adds that some babies are born with a flat head, especially if they arrive early, and that this is “usually nothing to worry about.” The positional kind tends to show up a bit later, at a few months, once she’s spending long stretches on her back.
The two shapes you might notice
The NHS describes two patterns:
- Flat on one side (plagiocephaly). The head may look uneven from above, and her ears “may not line up.”
- Flat across the back (brachycephaly). The head “may look wide and the front of their head may bulge outwards.”
Looking down at her head from above, during a feed or bath, is the easiest way to check. The NHS says to watch for changes, because “the earlier flat head syndrome is recognised, the easier it is to stop it getting worse.”
While you’re feeling her head, the soft spot is a separate thing. Your baby’s soft spot covers what’s normal there.
Back to sleep doesn’t change
This is the line that matters most. Flat spots are not a reason to change how she sleeps. The NHS says plainly: “do not change your baby’s sleeping position – they should always sleep on their back to reduce the risk of sudden infant death syndrome (SIDS).” The AAP says the same, and adds that a flat spot from back sleeping “usually rounds out as they grow older and sit up.”
So no wedges, rolled towels or head pillows in the crib to hold her off the flat side. The NIH’s Safe to Sleep campaign lists positioners among the items that don’t belong in a baby’s sleep space. Nationwide Children’s is direct about it: “Do not use anything to hold the baby’s head in place. This might block the face and make breathing hard.”
What you can safely do at sleep time, per the AAP: “alternate which end of the crib you place the baby’s feet.” Babies turn toward light and interesting things, so changing which end she faces gets her looking the other way without anything in the crib.
What helps: time off the flat spot
All of this happens while she’s awake and watched.
Tummy time. The AAP suggests starting from the day you come home with short sessions “2 to 3 times each day for a short time (3 to 5 minutes),” and building to “15 to 30 minutes each day by 7 weeks.” Nationwide Children’s suggests starting with just 1 to 2 minutes at a time. Put a toy on the side away from the flat area so she turns toward it. If she screams through every session, Betteroo has ways to get tummy time in when she protests, including on your chest, which all counts.
Less time in the seat. The AAP suggests limiting time “in freestanding swings, bouncy chairs and car seats,” which all press on the back of the head. The NHS says to take her out of the car seat “as soon as you get to where you’re going.” Car seats are for the car.
Switch sides. The NHS suggests varying “the side you feed and carry your baby.” The AAP points out that breastfed babies usually switch naturally, and suggests switching sides during bottle feeds too.
Move what she looks at. When she’s on her back and awake, the NHS suggests changing “the position of your baby’s toys and mobiles” so she turns her head both ways.
The head-turn preference and a tight neck
If she always turns her head the same way, look at her neck as well as her head. The NHS says a flat head can come from “tight neck muscles (torticollis),” which makes “a baby always rest their head on the same side and they may not be able to turn their head.” Nationwide Children’s says treating torticollis “is important” to help the head shape. It often involves daily stretching exercises that your pediatrician or a physical therapist will teach you.
Don’t guess at neck stretches from a video. Get them shown in person.
What about helmets?
Helmets are a doctor’s decision, not a first step. Nationwide Children’s says “some infants may need a custom-made helmet or band,” and that “your baby’s doctor will let you know if this is the right treatment.” UCSF Benioff Children’s Hospitals says repositioning “usually works well when started early, before 6 months of age,” with a helmet considered if the shape doesn’t improve. In the UK, the NHS doesn’t provide helmets for flat head syndrome “because there’s not enough evidence to show they work.” If a helmet comes up, ask your pediatrician what they expect it to add over repositioning, for your baby specifically.
When to call the pediatrician
| What you’re noticing | What to do |
|---|---|
| Slightly misshaped head in the first weeks after birth | Usually normal; it often rounds out |
| A flat spot that’s starting to show at a few months | Bring it up at the next checkup; start the awake-time fixes now |
| Flat spot getting worse despite tummy time and repositioning | Ask at the next visit, or call sooner |
| Head always tilted to one side, or trouble turning it | See the pediatrician (possible torticollis) |
| Ears or forehead noticeably uneven | Ask at the next visit |
| You’re worried about the shape or size of her head | The NHS says that’s reason enough to see a doctor |
The NHS notes that “rarely” a flat head at birth can be a sign of craniosynostosis, where the skull bones join too early. Nationwide Children’s calls it “not very common” and says your provider will decide whether testing is needed. That’s why a shape that worries you gets a look rather than a wait.
The 2- and 3-month checkups are a natural time to ask. Your 2-month-old baby and your 3-month-old baby cover what else those visits look at.
FAQ: baby flat head
Does a flat head affect my baby’s brain?
No. The NHS says flat head syndrome “does not affect their brain or development.” It’s a change in shape.
Will my baby’s flat head go away?
Usually it improves. The NHS says it often gets better in around 1 to 2 years. The AAP says a flat spot usually rounds out as babies grow and sit up.
Should my baby sleep on her side to fix a flat head?
No. The NHS and AAP both say babies should always sleep on their backs. Fix the flat spot with awake time: tummy time, holding her, and switching sides.
Are baby head-shaping pillows safe?
Don’t use them for sleep. The NIH’s Safe to Sleep campaign lists positioners among the things that don’t belong in a baby’s sleep space. Nationwide Children’s says not to use anything to hold a baby’s head in place.
When do babies need a helmet for a flat head?
Only when a doctor recommends one, usually after repositioning hasn’t been enough. Ask your pediatrician.
