My daughter is 7, 60lbs and 48 inches tall. I tried having cloth pullups made for her, but they leak. I think she would fit in the large superundies, if they run true to size...the only part that might not fit is the waist.
Any ideas other than the super undies?
I haven't used the large superundies - but having used the mediums (and compared to other cloth trainers) they tend to run small and are pretty tight. Depending on when you want to use the superundies for, that might not work out well. We do use large happy heiny cloth trainers, which are somewhat more size-flexible seeming. I'd look at those too.