Piaget found four major developmental stages (with many subdivisions). For the first year and a half or two years of life, infants are only aware of sensorimotor experience, and do not connect it ...

The sensorimotor stage is a time when your ... showing that some skills develop in children much earlier than Piaget's stages suggests. This is partly down to the limitations of 1950s technology.

Jean Piaget's ideas about child development continue to influence pedagogical practices around the world. His pioneering work revolutionized our understanding of how children learn and think.