My son is eleven weeks old and up until this point I have only pumped for an occasional bottle here and there. I would like to start pumping on a regular basis so that I have a supply in the freezer in case I need it for date night and things like that. Anyways...I fed my son around 9:45 PM and I did a pumping session around 11:45 PM. I pumped for twenty minutes I only got a little over one ounce from each breast. Is this a normal amount to get? It seems a bit low to me, but I don't know if this is something that will gradually increase over time. Also, my son has been consistently sleeping through the night for the past couple of weeks. Should I set my alarm clock and pump again in a few hours or is that likely to cause overproduction?