My baby is only 3 weeks old and he is constantly hungry. He used to only drink less than average which is 40-50ml around 2hrs interval but now he’s drinking 80-90ml at 1.5 to 2hrs interval. I’m worried about over feeding but when we gave him less milk he got all the hungry cues. He won’t sleep until we feed him more milk. He’s on formula feeding. Is this normal and what do i do if it’s not?