DD (4.7yrs) has always been a different shape to DS (6.5yrs). He lost his toddler chubbiness fairly quickly and is now fairly slim, whereas she's a lot more solid looking. Today she was complaining that her knickers are going up her bum. I had noticed this and was thinking that she needed a bigger size. Problem is that the ones she is in are size 5-6yrs so she would be wearing size 6-7yrs and she isn't yet 5!! AIBU to be a bit concerned about this: her diet is fairly healthy, I don't feed her junk or anything. She has always eaten more than DS because she likes more foods, whereas he's quite fussy.