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 the

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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 ability to grasp and then manipulate the rattle shows a progression from simple to more complex motor skills, illustrating hierarchical integration.

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