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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.
At the age of 18 months, children become fascinated by the behavior of other children their own age or older. This is why often the 2nd and 3rd child is potty trained a lot earlier than the first child. By the age of 24-30 months, they start to understand gender differences and focus on imitating the behavior of the same sex parent.