My son is almost 3 weeks old. At first I had too much milk for him, now it seems that I don't have enough in my left breast. He eats from one breast at one feeding and then the other at the next feeding. Lately i noticed i have been getting lopsided (right breast fills quicker and with more) and my left does not leave him satisfied all the time. Do i need to pump my left breast after he finishes to increase the supply for him? Will a manual pump work or should I use an electric? Any feedback would be great. Thanks!