Coordinating attention with a social partner is regarded as a major milestone in infant development, with an impact
on social learning opportunities, on promoting language, and on enhancing cognitive and socioemotional development
. It has been suggested that such social-communication behaviors serve different functions,
as in the use of social attention coordination for sharing (declarative) and requesting (instrumental-imperative) purposes
. Furthermore, whether the infant initiates or respond to bids in
interactions with social partners are viewed as representing different developmental processes