The sensorimotor stage is the first of the four stages of Piaget’s theory of cognitive development. It is marked by a child’s knowledge that the outside world exists separately from themselves.

To help answer this important question, child development experts have created lots of different charts and checklists that can help you keep track of child development across several key domains ...

Stage 3 — Preschool. Development at this stage centers around initiative and guilt. This stage begins at age three and lasts until age five. Here, your child focuses on doing things ...