Months 13-18

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 search^{41, 45}

Experiments with objects to learn how they work through problem solving or trial-and-error^{43, 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 holes^{41, 45}