Happy Birthday to your toddler! And congratulations on becoming the parent of a 2-year-old. Many toddlers — girls especially — are physically ready to begin the process of potty-training now. If your toddler can pull her pants up and down, follow simple instructions, stay dry for three or four hours (a sign that her bladder muscles are developed enough to hold and store urine), and dislikes the feeling of being in a dirty diaper, bring out the potty seat. Start a routine of sitting on the potty once or twice a day, with or without diapers. (For next steps, see our comprehensive toilet training area.) If she's not ready, back off and try again in a month or two.

Learn More: Other signs your toddler's ready to potty train, ten skills doctors say your toddler should have mastered by now, and more insights into your 24-month-old's development.