Using Table 5.2 (Attached), How do David’s motor skills compare to the gross- and fine-motor skill milestones listed in the table? Should Mark and Nicole be concerned if David does not reach the milestones at the average age listed in the table? Why or why not? Using Piaget’s Theory, explain which sub-stage of the sensorimotor stage best depicts David’s behavior and why. What behaviors would you expect next in David with respect to intentional behavior? Describe the behaviors you would expect in a securely attached child.

AVERAGE AGE AGE RANGE IN WHICH 90 PERCENT MOTOR SKILL ACHIEVED OF INFANTS ACHIEVE THE SKILL When held upright, holds head erect and steady 6 weeks 3 weeks-4 months When prone, lifts self by arms 2 months 3 weeks-4 months Rolls from side to back 2 months 3 weeks-5 months Grasps cube 3 months, 3 weeks 2-7 months Rolls from back to side 42 months 2-7 months Sits alone 7 months 5-9 months Crawls 7 months 5-11 months Pulls to stand 8 months 5-12 months Plays pat-a-cake 9 months, 3 weeks 7-15 months Stands alone 11 months 9-16 months Walks alone 11 months, 3 weeks 9-17 months Builds tower of two cubes 11 months, 3 weeks 1019 months Scribbles vigorously 14 months 10-21 months Walks up stairs with help 16 months 12-23 months Jumps in place 23 months, 2 weeks 17-30 months Walks on tiptoe 25 months 16-30 months BSIP SA/ALAMY LAURA DWIGHT PHOTOGRAPHY LAURA DWIGHT PHOTOGRAPHY