And I spoke to the doctor this morning, he told me that it's obvious that formula might be solving one part of the problem (the weight) but it's creating others (constipation, nipple confusion), so we agreed on me trying to supplement with my own milk and have the baby weighed weekly to monitor her development. But let's see if I can make it: As I mentioned, I'm pumping a lot but obtaining very little volumes of milk. I wanted to ask you about this; how much milk should I expect to get after 20 min pumping with an electrical pump? And also, is it OK to pump as I breast feed? As if I had twins or something... Hopefully that will increase my supply?