My baby is 4 weeks old and every since 3 weeks she's been formula fed and she has been wanting to eat 4-6oz. every 3 hours or less unless she's asleep! She's sleeping through the night (about 6-7 hours). But during the day she acts like she just wants to eat all the time! She was 8 pounds when she was born and now she's about 10 pounds. I feel like I'm over feeding her but she's not spitting up or throwing up after eating