Between about 2 and 3 months, social smiles are elicited

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Social smiles in infants between 2 and 3 months are primarily elicited by faces in the frontal position. Research has shown that infants at this age have a preference for faces in the frontal position and will actively seek out and respond to them with smiles. Other human features or caresses may also elicit smiles, but the primary stimulus for social smiles is typically faces in the frontal position. Principal and secondary attachment figures may also play a role in eliciting social smiles, but this is not the primary factor.

Between About 2 and 3 Months, Social Smiles Are Elicited