My little man is three weeks old tomorrow and was born at 36.3weeks weighed in at 5lb 5oz no problems and came home with me three days after c-section and has gained 16oz in the three weeks. He is BF but added a 2oz bottle of formula three times a day after nursing (he usually doesn't finish he just cant hold it all). The pediatrician added the formula to fight a slight case of jaundice which he overcame but told me to keep it up so we could put some weight on him. He seems to be happy and wants to nurse every two to three hours just like he should and had plenty of wet diapers but when it comes to poop diapers it is only every three days right when I start to worry (about the third day) he does a diaper full. I have looked at all the info on line and its my understanding this is not enough but he is gaining and he seems to be satisfied does not cry with constipation. Just wondering what you Moms think he has a Pediatrician app. tomorrow but I value the experience of you Moms just as much if not more than his pediatrician.