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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.
On average, girls are potty trained by 29 months, according to the University of Michigan Health System. Girls typically learn to control their bladder muscles and bowel before boys, who are trained at an average age of 31 months. However, toddlers become ready for potty training at different rates, so don't push your daughter to start training before she's ready.