I've found that my girls have much different body shapes from my boys, right from birth.

My girls have chubbier thighs, rounder bums and little bit of breast shape, if that makes sense? Like if I give my DD2 or DD3 a cuddle side on, they get a boob line between their breast shapes. (lolling at my description!!)

My boys both had skinny legs, barely a bum and completely flat, almost bony chests.