Accidents sometimes continue for months after the toilet-training process appears to be complete—even when a child is three or four years old. Such daytime accidents are part of learning new physical habits and should start to taper off by about six months after training. (Nighttime wetting can continue much longer.)
However, quite frequent accidents in a three-year-old—particularly when they do not seem to be diminishing—may signal a physical or developmental problem. Your best move is to talk with your child's pediatrician about his toilet-training history and current behavior and, if requested, take him in for a checkup. If there are no physical problems, your concerns will be put to rest. If there is a developmental delay or physical issue, your prompt attention will speed up the treatment process.