how much do your newborn eat?

My baby Chloé will be one month on the 23rd & graduated tremendously I think in feeding. Her first two weeks she was being breastfeed with an occasional formula bottle. Then she started wanting more than I was producing. (From 2 oz to 3) then the third she was drinking Similac the graduating from breastfeeding version. I would give her 2 ounces then she would be very fussy so I started giving her another 2 ounces 20 min. Apart & she'll completely finish it. Now I just straight give her 4 but I hope I'm not over feeding her. She doesn't spit up or anything.