I have a medela pump and on average I get 4-5 ounces total when double pumping. I've heard that 3-4 ounces is about average at a pumping session. The pump is obviously not as effecient as baby. I used an $80 playtex double pump before that but one day a plastic peice broke off...ugh so cheap. It works about the same. I find the best luck pumping first thing in the morning. Also you can see if taking a shower before hand, making sure your relaxed, drinking LOTS of water, and fenugreek might help give you a little supply boost.