My LO is almost 3 weeks old and since he was a newborn he's never really been a baby that gets fussy and wakes up wanting to eat. In the beginning I would feed him every 3 hours but it would be a struggle to keep him awake. Today he's been going every 4 hours to eat and still has been sleeping all day. Is this something I should be worried about? Anyone else have babies that never woke up wanting to eat?!?