Final answer:
Early childhood is the life stage between infancy and middle childhood, characterized by significant physical, cognitive, and psychosocial development.
Step-by-step explanation:
Early childhood is the life stage between infancy and middle childhood. It is divided into toddlerhood (ages one to three) and the preschool years (ages three to five). Early childhood is a time of great physical, cognitive, and psychosocial development. Children go from just starting to walk and using a word or two at age one to riding a bike and using 1,500 words at age five. While the one-year-old toddler clings to her parents, the five-year-old preschooler runs off to play with her friends.