I use imagine smart-fit prefolds which are very comparable in size to GMD's. I had the newborn (XS) size that hardly got used because I waited a few weeks and then she was a heavy wetter and we needed to size up. Currently using the smalls and she is around 10lbs or so. Curious if anyone skipped the size medium and went straight to the large? I feel like for my DD the way they list the sizing in pounds is a bit generous meaning the newborns did not fit until 10lbs and I don't know that the smalls will fit until 17lbs, so should I skip the 12-25lbs and go straight to the 15-30lb ones? I guess I would rather they be a bit too big than a bit too small. Plus then maybe they would last through potty training.
Re: prefold sizing
you might want to XP on the cloth diaper forum... they would probably have a range of ideas for you... i just use pockets, and never got into prefolds...