Alright idk if it's just me but my son eats a lot! He eats 3 oz of formula right now but he always seems to be hungry after that. So I fed him 4 oz recently and he ate it no problem. He's only 1 month old, is that normal?? I'm a ftm so I have no clue! Should I keep it at 3 or up it to 4 oz already.