An infant who understands sucking on a nipple for food will also try to put any other object into its mouth, whether the object is food, a toy, or even a bug. In Piaget's terms, the infant is demonstrating:

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The infant is demonstrating assimilation, which is the process of incorporating new experiences into existing schemas or frameworks. In this case, the infant is applying the sucking schema to various objects.

An Infant Who Understands Sucking on a Nipple for Food