My baby is still hungry.

Tanya
My preemie was supposed to be due on New Year's Day. He came into our lives on November 2. We have had him home now for a little over 3 weeks.  His pediatrician said that he needs to eat every 3 hours and no more than 3 oz.  I give him 3oz at every feeding. I can tell he is still hungry. I have a pediatrician appointment this coming Friday and will talk to his dr then. I feel bad not giving him more milk. Any advice.