Feeding baby enough?

Brittany

My baby is about to be 6 weeks old. We are currently feeding her 3 ounces (formula) every 2-3 hours. For a while she was having 4-5 hour stretches at night but lately she’s been awake feeding every 2 hours on the dot. Is she maybe not getting full enough? How much and how often are your 6 week olds eating? Trying to get her to sleep longer at night, momma needs sleep!