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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.
What is the average age for toilet-training? The physical maturity and readiness skills needed for successful toilet learning appear at the same time in girls and boys-between 18 and 30 months of age. The average age for girls to be toilet trained is 29 months, and for boys it's 31 months. Keep in mind that these are averages.