I ebf but when I did give my baby a bottle after 9 months he only drank 5 oz. That was because he was breastfed though. I really don't know

I have no clue. I breast feed/ pump on demand (4 month old can eat anywhere from 2-4 oz per feeding every 3-4 hours or so) If you're bottle feeding I think it's frequency of how many hours in relation to how many ounces.