Follows simple orders with prompts (e.g., show me, give me the ball) 41
Identifies an item from a group of items41
Starts to understand numbers (18 months)41
Looks for items named but not present through systematic search41, 45
Experiments with objects to learn how they work through problem solving or trial-and-error43, 41, 33
Remembers previous actions of others41
Recognizes and identifies pictures and objects by pointing41
Recognizes familiar places41
Adapts familiar actions to new situations41
Likes putting things in holes41, 45
Experimentation is used to learn how objects work; uses problem solving or trial and error
Follows simple prompts such as, give me the toy
Previous actions of others are remembered; attempts to replicate the caregiver brushing his or her hair