“…Gaze following measured at the end of the first year predicts both vocabulary size and rate of growth in vocabulary over the first two years of life (Brooks & Meltzoff, ; Tenenbaum, Sobel, Sheinkopf, Malle, & Morgan, ). The ability to imitate the goals of actions in the second year of life predicts language production skills at 3 years (Charman et al, ) and can even predict whether an infant exhibits later language delays (Zambrana, Ystrom, Schjølberg, & Pons, ). Engaging in joint attention, which involves sharing attention with a partner to a third entity, such as when an infant is attending simultaneously to both a parent and a toy (Seibert, Hogan, & Mundy, ; Tomasello & Farrar, ), involves much of the behaviors used to measure infants’ action understanding listed above and has been implicated as a manifestation of infants’ intention understanding (Salo, Rowe, & Reeb‐Sutherland, ).…”