help please. not sure what to do.

So I'm a ftm and I'm unsure what to do. My little girl is 6 days olds and has been sleeping practically ALL day today. She will eat when I wake her up but she hasn't woken up on her own to tell me she's hungry. When she eats she eats a lot, practically until she falls back asleep. I know babies are to sleep A LOT. I just don't know if this is too much. She has gone like 4 hours without eating. She has has a few bowl movement this morning but not much this afternoon (even pee). She doesn't appear in any kind of pain. She is also a bigger baby (8lbs 6oz) so it doesn't seem like she is lacking nutrition.