My little boy turned 3 weeks old yesterday, within a week of being born he was drinking 4oz bottles, now he's on 5 but he's draining them. Does he need 6 ounces? I read online that there should be milk left when babies are finished feeding and that way you know they've had enough. I don't force food into him, whenever he seems to be finished I leave him, I don't prod the bottle round his mouth and he doesn't get sick much which makes me think he isn't taking in too much milk or he'd bring it back up? It just seems like a lot for a little one of 3 weeks. He's on carobel also if that has any relevance.