A baby grasps for his/her rattle at 3 months of age but cannot quite get hold of it.However,by 11 months the baby is holding and moving the rattle with total control.This is an example of

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The principle of hierarchical integration suggests that simple skills typically develop separately and independently but are later integrated into more complex skills. In this case, the baby's initial grasp is a simple skill that evolves into the more complex skill of holding and moving the rattle with control.

A Baby Grasps for His/her Rattle at 3 Months of Age