I have been back at work for three months (since DS was 7mo), and have always been able to get 9-10oz over three pumping sessions. In the past few days, I have been getting 7-8oz. I've heard of your body becoming less responsive to the pump after the 9 month mark, so is this probably what's happening to me? My pump was given to me by a friend (Medela PISA) who used it for about 6 months with her son. I used it on and off for 7 months while I was home, but have only been using it regularly (3-4 times a day, 5 days a week) for 3 months. I'm afraid the pump may be wearing out, and I only need 2 more months out of it! (I plan to wean from the pump, but continue to nurse) I've replaced membranes, tubes, etc. so I know it's not that. Any thoughts? Don't tell me I need a new pump!