I have a 20 year old disabled child, still in diapers. She only weighs 65 lbs and is very thin. The XL fit perfect, I was using an old Gerber XL, which they don't make anymore, and I was getting worried I couldn't find these anymore. The diabled places only cater to adult sizes and are way over priced. Thank you for having them. And I like the way you have the measurements available, it's very helpful.