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 These processes have in turn been suggested to reflect separate aspects of developing biobehavioral systems. Importantly, the same biobehavioral systems have a central role in the infants’ emerging regulatory competence and effortful control. One would therefore assume these behavioral characteristics to be related to socialcommunication
behaviors. However, the empirical evidence for such associations in the first year of life is limited