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no release, grasp reflex is strong

0-1 month

mutual fingering in midline

4 months

involuntary release

1-4 months

transfers object from hand to hand

4-8 months

two stage transfer taking hand grasps before releasing hand lets go

5-6 months

one stage transfer taking hand and releasing hand performs actions simultaneously

6-7 months

volitional release

7-9 months

presses down on surface to release

7-10 months

releases above a surface with wrist flexed

8 months

releases into a container with wrist straight

9-10 months

clumsy rease of object into container hand rests on edge of container

10-14 months

precise controlled release with wrist extended

12-15 months

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