You can stretch a babies belly out from overfeeding and upset their stomach. I wouldn't do more than 3-4 oz at a time. Does he take a paci? Sometimes they just want to suck for comfort and not food.
I would feed him as much as he can eat. When my 12 yr ild sin was 2 days old, he ate like 4 oz. I know that seems alot, but the nurse said, if he wants its ok to give him that much