hi. So are you bfeeding, if not formula has to be every 2.5 or 3 hours in order for them to not cause colic or gas, so do try to feed her at least every 2.5 hours. Maybe try a bigger nipple, but i remember that ds ate 2 or 3 oz every 3 hours , 2 when he was constipated and this was until 3.5 months old...so do not worry about the amount, she knows waht she needs, some babies are not gigantic eaters, but if she is crying a lot you should check out about a reflux or colicky possibility and give some meds, Mylicon works perfectly... Some babies with reflux need to eat more often because eating feels better for them when something is hurting in their throat... Reflux does not necessary appears from day 1 of birth it can come later too...