At the moment, Kiddo is only available in Medium. I usually wear mediums, but kiddos are a bit on the small size (but still fit okay on me with a 34 inch waist). They are definitely in between a small and a medium in Tena, and definitely smaller than ABU's Medium. If you are a small person, you will love them - one of my good AB friends pretty much only fits into Kiddos as smalls are just a bit too small, and tapes overlap when he wears medium. Large is coming soon though, and should be available in December.