“…Studying these infants allows for the prospective study of ASD. Previous research has found relatively comparable early language environments of infants with and without a family history of ASD [Campbell, Leezenbaum, Mahoney, Day, & Schmidt, ; Northrup & Iverson, ; Swanson et al, ; Talbott, Nelson, & Tager‐Flusberg, ], while some subtle differences in the timing and synchrony of parent–child interactions have been reported [Northrup & Iverson, ; Wan et al, ]. Studies of older children with ASD showed that responsive caregiver language was associated with better joint attention and language skills [Bottema‐Beutel, Yoder, Hochman, & Watson, ; McDuffie & Yoder, ; Siller & Sigman, , ].…”