Aware of vertical space (fears heights) 14
Begins understanding and reacting to small commands (e.g., no-no or give it to me)14, 30
Interested in details of objects14, 41
Object permanence14, 41
Looks for contents in a container41
Gets bored with repetition of same stimuli14, 41
May recall events from previous day14
Can keep a series of ideas in mind14
Begins to show persistence (6-9 months)14, 95
Reaches for toy behind self without using visual senses14
Sees objects as separate from one another14
Increasingly imitates behaviors of others including tool use14, 41
Modifies actions through trial-and-error to achieve goal14
Begins to know and point to body parts14
Matches two blocks14
Responds with expectation to repetition of event41, 14
Makes goal-directed actions41
Experiments with objects41
Manipulates more than one object at a time41
Persistent in search for desired object41
Begins to show humor and teases41
Performs different actions with toys, depending on their characteristics41
Sustains interest in play (attends to both toy and adult) 41
Dumps objects out of container41
Shows interest in fitting things together41
Combines two objects functionally41
Understands few object names41
Uses objects to complete tasks41
May manipulate more than one object at a time
Humor and ability to tease emerges
Increasingly imitates the behavior of others, including tool use
Looks for contents in a container