My baby is 5 weeks old on Monday and he's already on 6 Oz 210ml and then still wants more... He's a very happy and calm little boy so I'm not worried that he's over feeding or anything but I don't know if it's right to start using the follow on milk / next one up or is it too soon? Just want to know what other people have done or any advice really as me and my partner are new parents so have no iidea. Thanks