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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 age at which children are toilet trained hasn't always been the same. In the 1940s, for example, most toddlers began potty training before they reached 18 months of age, according to a 2008 report in American Family Physician.. White parents also tend to begin training later than African American parents.