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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.
Children who were toilet trained after 32 months were more likely to have urge incontinence -- daytime wetting and bed-wetting -- between ages 4 and 12. And potty training children sooner than 27 months generally doesn't work either, according to background information in the study.