The quality of infant-caregiver interactions is well known to have long-lasting effects on the development of children’s self-regulation and language. Yet the real-time mechanisms through which caregiver and infant behaviors build self-regulation and language day-in day-out are not known. My research aims to uncover the dyad behaviors that moment-to-moment train self-regulation and language by extending infants’ engagement with objects while creating ‘object-word’ mappings. I use head-mounted eye-tracking and micro-behavioral coding to analyze relations between caregiver and infant behaviors (i.e., eye-gaze, object manipulation, gestures, and language) during naturalistic interactions in lab and home environments.