What function do emotional expressions,such as crying and smiling,serve in the relationship between a parent and a young infant?

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Emotional expressions, such as crying and smiling, serve as an early form of communication between a parent and a young infant. Infants use these expressions to communicate their needs and desires to their caregivers, who respond accordingly by providing comfort, food, or attention. This process helps establish the infant-parent bond and lays the foundation for future social and emotional development.

What Function Do Emotional Expressions,such as Crying and Smiling,serve in the Relationship