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Alessandro waves his arms around but has difficulty grasping objects with his hands. This demonstrates the

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The condition in which Alessandro waves his arms around but has difficulty grasping objects with his hands demonstrates the proximodistal principle of growth.
The proximidostial pinciple of growth describes the development in which the spinal cord develops before outer parts of the body. So, the child's arms develop before the hands. Also the hands a develop before the fingers.
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