My son has always been in the 100th percentile for the size of his head, ever since birth. But I think a lot of it has to do with how BIG his forehead is! Me and df both have flat normal looking foreheads and so does our 15 month old daughter but our son has always had one of those, as the doctors put it, "protruding" foreheads. Will it ever flatten??? His nose and forehead stick out at the same distance!! I have no idea where his forehead came from??