This document summarizes Piaget's four stages of cognitive development and provides examples of toys that align with each stage: 1) The sensorimotor stage from birth to age 2 where infants learn through senses and actions. A 5-in-1 gym helps infants realize they can perform actions. 2) The preoperational stage from ages 2-6 where children think symbolically but egocentrically. A play kitchen set helps them understand other perspectives. 3) The concrete operations stage in school-aged children who can understand conservation. An Easy-Bake Oven set demonstrates that quantities remain the same after "baking". 4) The formal operations stage in teens who can think