Flat head syndrome is not dangerous and doesn't affect brain development, and as long as they're doing tummy time, most little ones grow out of it on their own by around six months, when they're rolling over and starting to sit up.

How long does it take a flat head to round out?

It can take 9-18 months before a baby's skull is fully formed. During this time some babies develop positional plagiocephaly. This means that there is a flat area on the back or side of the head.

Will babies flat head round out?

In most cases, your baby's head shape will resolve on its own. Given time and a little effort, your baby's head will grow and return to normal as they begin moving and doing more. Wearing a helmet is also a good way to correct large malformation or flat spots on your baby's head.