DS is 16 mos and has been in Green Mountain Diapers (GMD) red-edge (medium) prefolds since 5 mos of age. DS is 33" and 23 lbs.he is really tall but has a skinny waist. The red edge dipes still fit him but are kind of on the small side. THe main issue though is that now i noticed i have to change his diaper every 1.5 hrs vs every 3 hrs...he is really soaking the dipes and i've started getting leaks for the first time ever. So, i was wondering if now is the time to go to next size up? I noticed there are two larger sizes, a size called Large (brown edge) and a XL Toddler size (green edge). Anybody have any experience with either of these sizes? The XL looks HUGE, tho i'm wondering if it would be better to go straight to that size for the absorbency. It says 28-40 lbs, so i worry if it may be too big. Plus, i wouldn't know what covers to use for XL size. it seems L size would correspond nicely to Bummis size L covers (27-35 lbs range)...