I sh!t you not, I just had to pack up two 9 month rompers because they were too small for ds. He has a gigantic 99th percentile head and length (and he packed on the pounds since his last appt so he's probably up there in weight from his 90th percentile). He's 17 lbs now. I could not get them over his head and they were polos with 3 buttons so I figured they would be MORE than safe in the head dept. A 3 month old outgrowing 9 month clothes makes me shed a little tear. He's growing so fast!