I just started pumping to slowly build up by stock pile and to slowly increase my milk supply. As of now I am only pumping maybe once or twice a day after my daughter feeds, he is almost 3 weeks old. I am pumping for 15-20 mins and I am only getting a max 1 oz total out in one session. There are times that I barely get out 1/2 an ounce. There also seems to be more breast milk being pumped out of my left breast. My left breast is the one which I am using a breast shield for because of pain during nursing. I am trying to wean off the breast shield but have been unsuccessful at this time. I will continue to attempt to not use the nipple shield. Is it normal to get more milk out of one breast then the other or is because of the use of the nipple shield in my case?