I, like several moms I know, crave organization, yet rarely accomplish it. Things are definitely easier when there is no baby. So when i was pregnant with Cooper, I accomplished organization while waiting for his arrival. I went through all the clothes we had gotten and organized them according to sizes and put them in bins (with labels on the front). I was really proud of myself!
However, once Cooper came, I quickly realized the flaw to my perfect plan. Baby clothes brands vary with their sizes, and Cooper was a big boy growing very fast. I actually missed a couple of outfits becuase I had them in the 3-6 month bin and it was comparable to 0-3 month clothing. So I have a fix and a recommendation to all who want to try this method.
Organize clothes by size still and put in the bins, but keep on hand a size chart for the brands you have so you know when to pull "such and such" brand clothing out. I had washed most of the clothes before hand or a lot with tags, didn't include the size chart. I had an extremely difficult time finding the size charts online so I hope to have a decent collection on here for other moms-to-be. I will update as I get/find more information.