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A toddler is a child approximately 1 to 3 years old, though definitions vary.[1][2][3] The toddler years are a time of great cognitive, emotional and social development. The word is derived from "to toddle", which means to walk unsteadily, like a child of this age.[4]
The term toddler comes from the way that children first walk, which is at first unsteady and more like a toddle than actual walking.