How many ounces of formula for 10 week old?

Jade

I was just wondering how many ounces should my 10 week old daughter should be drinking in a day? I give her 4 ounce bottles between 3-4 hours but in a day it has equaled to only 16 ounces? I feel that she should be drinking more but am not for sure. I was breastfeeding up until a week ago. Any answers would be extremely helpful!