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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.
Potty Training Photo Credit Sergey Khamidulin/iStock/Getty Images. Your toddler girl probably likes the same cartoons and throws the same tantrums as boys her age, but she might be ready to potty train before they are. Average ages give you an idea of what's typical, but every child's potty-training journey is unique. Plan on starting to ease her out of diapers after she turns 2 years old, and trust that she'll show you when the time is right.