E.M.
My daughter trained at 3 yrs, 3 months and did great for a long time!
(Maybe 6 months?) and then started having lots of accidents. Made me crazy at the time! I considered putting her back in diapers, but was warned against this by her preschool teacher. She just kept telling me to stay calm, have her help clean up her accidents and wash out her undies, and that she would eventually get back with the program, which is exactly what happened. It is so frustrating, but hang in there!