Age (months)
Performance
1 to 3
Strong finger tension, grip reflex exists, can keep grip on the ring
3
Retained grip on the ring, fingers grasp clothes, gaze and play with hands
3～4
Grip reflex disappears, can hold hands together, active grasping action, gaze at the toy in hand and take it to the mouth
5
Finger end palm heel grip, gradually appear radial hand grip (full grasp)
5~6
Both hands try to take blocks, rake small pills and ropes, can grasp their own feet and play with toes
6～7
Both hands interchange toys, shake the rattle, grip the tendency to hold the radial palmar grip, unsuccessful low-level scissor grip small pills
8～10
Radial finger grasp action skilled, fingertip grip (finger grip) small pills gradually perfect
10
Available index finger finger object, plucking
12
Dexterous pincer pinching, voluntary release, and becoming more refined with age
12 to 18
Pile up 2 to 4 blocks, scribble, cap bottles
18～24
Pile up 6 blocks, can turn books on his own
24～40
Pile up 8 blocks, build bridges, thread beads, and try scissors