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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]

^ "toddler". The Free Dictionary.
^ Barker R (2001). The Mighty Toddler: The essential guide to the toddler years. Sydney: Pan Macmillan Australia. p. 1.
^ Lieberman AF (1993). The Emotional Life of the Toddler. New York: The Free Press. p. 1.
^ Brown, Stephanie (December 19, 2015). "What Is the Definition of a Toddler?". verywell.com. About, Inc. Archived from the original on November 14, 2016. Retrieved November 13, 2016. The term toddler comes from the way that children first walk, which is at first unsteady and more like a toddle than actual walking.