What's a normal amount of breast milk to express? I gave birth to my son 9 days ago and my milk came in about 3 days later. We're doing expressed breast milk because his arm was broken during the c-section (big baby, gestational diabetes) and it's too much to try to feed off of breast while it's healing. I'm expressing around 12.5 oz each time - sometimes 16 - (I keep forgetting and letting it go like 10 or so hours before expressing again). Doing it twice a day is more than enough for day's feeding, but I know he'll need more and more as he grows. Basically I am wondering what's a normal amount to express at 9 days old? And how much more I could expect to express as he grows before I need to supplement?