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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.
In the 1940s, the average age for potty training was 18 months. Averages today, according to a 2001 study by Schum, show baby boys in the United States give up diapers at 39 months and girls at 35 months.