WEll my recently potty learned dd was 40 lbs - I liked beccabottoms high rise ultratrims....daisy doodles....and I had a couple of Lukes Drawers that have fit since we started cd at 18 months!
I also used bumkins Xlarge..and I found that a large "berry basic" fits well...but I think that has since become a "very basic" and am not sure if the pattern is exactly the same.aio
She could wear the largest bum-ware but just barely...same with a jellybean aio, although our issues were usually with the leg not being cut high enough, no crack issues here
hth
ELizabeth