Oh Zoe, how worrying for you. I don't know the answer to your questions but wanted to send you some hugs. I think it would depend on how much he weighs and some other factors. Are you bfing? Was he premmie? Is he feeding well? These are all questions that will be relevant. I hope the dr gives you good advice tomorrow. But if he are not happy with what she says, don't be scared to get a 2nd opinion. Good luck hun.