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Flat head (plagiocephaly)

Also called: Flat head syndrome, plagiocephaly, flat spot on baby's head

A flat spot on the back or side of a baby's head, usually from lying in the same position. It's common, and position changes and tummy time usually fix it.

CommonMany babies in the first months
Main fixTummy time and turning the head
HelmetSometimes for severe cases

Overview

Babies should always sleep on their backs; flat spots are a small trade-off for safe sleep.

Tight neck muscles (torticollis) can make babies favor one side.

Symptoms

Common signs:

  • Flat spot on a baby's head

Less common

  • Head tilt
  • Prefers turning one way

Look up a symptom: Flat spot on a baby's head

When to get medical care

Call 911This isn't an emergency by itself. Call 911 for trouble breathing, chest pain, or fainting.
Get care todayA soft spot that bulges, or a baby who is very sleepy or vomiting.
See a doctor soonA flat spot not improving by 4 to 6 months, or a ridge along the skull.

Causes

Lying in one position, tight neck muscles.

Does it spread or run in families?

  • It isn't contagious. You can't catch it from someone else.

Who is more likely to get it

  • Premature babies
  • Twins

Possible complications

Diagnosis

Your baby's doctor looks at head shape.

Questions you may be asked

  • Head turning preference

The exam

Head and neck exam.

Treatment

Change positions while awake.

Self-care

  • Give supervised tummy time several times a day
  • Switch which end of the crib your baby's head goes
  • Hold your baby more; less time in car seats and swings
  • Keep back sleeping for safety

Physical therapy for tight neck; a helmet for severe cases.

Prevention

To prevent it:

  • Tummy time daily
  • Alternate head position

Which doctor treats this

  • Start with your child's pediatrician.

For caregivers

  • Learn the warning signs and when to call the doctor or 911.
  • Keep a list of your child's medicines, doses, and doctors on your phone.
  • Tell teachers, coaches, and sitters what to watch for and what to do.
  • Take breaks and ask for help. Caregivers need care too.

Outlook

Usually improves by age 1.

Getting ready for your visit

Bring a list of your symptoms and medicines.

Questions to ask

  • Does my baby need a helmet or therapy?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Flat head (plagiocephaly)

Sources

Last updated 2026-11-12.