My son is 12days old and his umbilical cord fell off last night. I'm out of diapers and since the cord is gone I figured I'd give the cloth a shot. My son weighs just over 8 pounds and I have bum genius 4.0s. He looks like he's swimming in them. They come almost up to his chest and the first one leaked all up his back.. Any advice, is this uncomfortable for babies size wise and how do I avoid leaks? Additionally his cord fell off but the belly button hasn't totally healed. Is it ok that the diapers go over it?