Mine never did but that doesn't make it not 'normal' All babies are different. Weight doesn't mean anything alone either. 13 lbs. sounds big when you say it like that but he is probably also very long. You should be due for a check up soon so you can talk to the ped then about your concerns. You most likely just have a big tall baby on your hands. Big babies are gonna eat more to meet their personal calorie needs to continue to grow properly.
at 7:09 PM on May. 29, 2009