My child is 18 mths. From the top I look at the head is abit slang not round. Will flat head affect him in future? Got ask doc b4 when he is 6 mths but the doc say they can't do anything let the head mould itself. But mould till now not so round. Shd I be concerned? I saw from website other countries got wear special helmet to make it round. Is it too late for my child now?