Hello everyone, I just don't know what's going on anymore, ??????? I u…

Hello everyone, I just don't know what's going on anymore, ??????? I understand that the baby is not quite normal weight, the pediatrician says it's a normal weight for birth at 2480 now 5300. He eats normally, about 130 all the time, he has been eating 80, 90, 100 for days 5, I don't understand what's wrong ???? we are at IV