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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.
The average age at which children complete toilet training in the United States is approximately three years old. In some cases children learn bladder control first; others learn bowel control before bladder control. Control is generally first achieved during the daytime, well before a child is able to stay dry at night.