My 11 week old DS is EBF- but gets bottles from daycare while I am work. Now my kid is huge....9 # 3.8 at birth. Last weight was 14# at 8 weeks and he takes 5-6 oz three times a day while I'm at work. I've never done a yield, but I usually pump 6-7 oz at 0900, 1200, and close to 10-11 oz in the early am and before bed. My DD (now three) never took more than 6 oz at one feeding in her entire life and she was EBF, her bottles were 4-6 oz from 6 weeks to 12 months. Same parents.