My younger DD (Nyna) was potty trained at thirteen months. It was a real good thing I could sew, since size zero panties were way too big. I used a "Chatty Cathy" doll pattern (now I have dated myself) to make them. Her nick-name for several years was 'nineytinyhiney'. She has since grown the family caboose, so now we tease her about being a 'buns over achiever'! (We all have the 'bubble' problem.)
P.S. I still don't know why we keep getting told we are a bunch of smart alecks!