Why would infants under 12 months wear helmet? don't know what it's called - this one resembles that for a fractured skull? i see it a lot nowadays.

Flat Heads: Flat heads or plagiocephaly is common now because docs are encouraging all infants to be put on their backs to go to sleep to reduce risk for sudden infant death. Some kiddos however may have problems with the skull bones closing prematurely and a helmet may be prescribed. Flat heads generally fix themselves but some parents prefer to have a custom helmet made to prevent further flatten.

Helmets: Since the recommendation to keep babies on their back to avoid sids, babies heads have become misshapened. In order to correct the misshaped head, babies wear these corrective helmets.