Toddler
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A toddler is a child approximately 1 to 3 years old, though definitions vary. The toddler years are a time of great cognitive, emotional and social development. The word is derived from "toddle", which means to walk unsteadily, as children at this age do.
By the age of two, toddlers typically reach several important milestones, including walking, running, climbing and speaking in short phrases. Their vocabulary expands rapidly and they begin to show increased independence as they explore their environment and make known their preferences.