How much is everyones newborns eating

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I was wondering how much everyones newborns are eating and what formula there on.. my baby is almost 3 weeks old she was eating every 3 hours 3 ounces she wont eat any more at the 3 hours then 3 ounces but now she gets hungry in between the hours and drinks another 3 more ounces... shes on Similac Sensitive just curious if its too much for her little stomach id like to get her to sleep through the night but i dont think its happening🤣