I'm trying to figure out when LO (who is 4 months), wakes up in the middle of the night, is she hungry, or waking up just to wake up. Obviously, if she wakes up 4-6 hours after she last ate, she is probably hungry. It's when she wakes up 2-3 hours that it's so hard to tell. Anyone know how to tell, or how often a 4 month old realistically needs to eat at night?