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On average, a girl is ready to be potty trained at approximately 29 months of age, says the University of Michigan Health System, compared to 31 months for the average boy.
An average time frame for success in toilet training is three to six months. It is common, however, for children to continue to wet at night until they are five years old. By six years of age, most children (90%) do stay dry all night. During the toilet training process, many children refuse to train and even regress.