K.H.
I went back to work when my baby was 13 weeks, and I am able to pump and feed him breastmilk, but my pedi told me to give him 6 ounces per bottle. Actually - he said my baby needs at least 32 oz per day...so I guess the amount per feeding depends on the number of feedings per day. I'm not sure if he would have told me a differently if he was taking formula.
Hope that helps!