The question asks about the developmental period when the emotional expressiveness associated with the "Social Smile" typically emerges.
The "Social Smile", distinct from reflexive smiles that occur during sleep, is a smile in response to social stimuli, like seeing a familiar face or hearing a gentle voice. It signifies the beginning of social interaction and emotional connection.
Babies develop their capacity for emotional expressiveness over time. While newborns might exhibit reflexive smiles, the deliberate "Social Smile" indicates a growing awareness of their environment and the people in it. This type of smiling is a crucial milestone in early social and emotional development.
Developmental psychology suggests:
The development of the "Social Smile" is linked to the infant's maturing visual tracking abilities and their increasing ability to recognize and respond to familiar faces and social interactions. This capacity for recognizing and responding socially blossoms significantly in the first half-year of life.
Therefore, the period of birth to 6 months is when infants typically start showing emotional expressiveness through the distinct "Social Smile".