Newborn feeding schedule : New mom

I have a 3 day old and she's been drinking 1 oz every 2 hours I try to get her to 2 oz but she'll stop at 1 and fall asleep every time. Sometimes I also feel like I'm over feeding her when I try to give her 2 oz because she'll throw up. She's drinking breastmilk and Gerber Goodstart. Mainly breastmilk now that supply is coming in. My question is do I really have to wake her up every 2-3 hours to feed? Even through the night? I'm okay with it during the day but at night I want to feed like every 4? I just fed her at 12 so I would like to feed her 2 oz at 4am and again 2 oz at 7 am? Is that okay?