The social smile is an important milestone in infant development because it indicates a maturation of the amygdala in the brain.

Name: The social smile is an important milestone in infant development because it indicates a maturation of the amygdala in the brain.
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The social smile is an important milestone because it indicates the infant's growing social and emotional development, primarily involving the cortex rather than the amygdala, which is more associated with processing emotions like fear.

The Social Smile Is an Important Milestone in Infant Development