My baby just started with formula, and I have a really dumb question that probably has a very "DUH!" answer...when I mix a bottle, I put 6oz water in it, then add in the powdered formula. Once it's mixed, there is about 7oz of fluid. If she drinks the whole thing, did she just take 6 or 7 ounces of formula? Sorry, she has had some weight gain issues so I don't know how much to tell the doctor she's getting per feeding.