That is just an average, so this means that there are a number of children trained closer to two, as well as others who reach this milestone around age four. The trick is to identify readiness and then proceed in a relaxed manner. If she does, or even if she simply knows that she has just gone, this awareness will help her get started. If so, regularity can help parents identify times of day when training attempts are most likely to be successful. This is a sign of wanting to be independent.
Underwear can also serve as a reward for the child's interest in toilet training.
This ability allows for easy access when she feels an urge to visit the potty. This may seem obvious, but sometimes the right signal to begin training is simply waiting for him to verbalize interest. Above all else, the key to success is patience. It is typical for the toddler to show a flurry of interest, only to back off once the novelty has worn off. Relax, the interest will come back.