It takes > 400 words: to give you specifics; see healthy children.org & firststeps.org. Gross motor develops head-to-toe from 0-12 mos. Fine motor develops from regarding one's hands at 2 mos. to hands in midline, proximal-distal. Grasp develops ulnar to radial, palm to thumb & index finger. Volitional movements require normal muscle tone & strength, vision, disappearance of primitive reflexes & "tummy time".
Answered 3/9/2015
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