I am currently breastfeeding my 5.5 wk old and would like to begin pumping for for storage for those times when I will be away from DD for longer than a couple of hours. Typically she nurses every 2-3 hours and sometimes its one side, sometimes both. When would be the best time to pump? I'm hesitant to nurse on one side and pump on the other at the same time because she may want to nurse on the other side when finished with the first. Or maybe this won't be a problem?