I bought prefolds when I had my DD to use as burp rags and this time I want to use them as actual diapers (with wool covers is my plan). I think I just bought a few packs of whatever they have at either Target or Babies R Us. Are these good/bad for actual diapering? Also, I have no idea on the size and I looked at the packages they have at Target and they said one size fits all. I tried them on 2.5 year old DD though and they were too small (at least for the way I folded them). Does that mean they're not one size fits all? Do I need to have multiple sizes of prefolds (I've seen sites that sell newborn, small, medium, large, and x-large)?
For some reason the whole world of prefolds feels so foreign to me! I'd really just like some guidance.