Key Points Question Was a clinic-based multimodel intervention, including a smartphone app and coaching, associated with improved language environment for children 2 to 12 months of age? Findings A pre-post study was conducted for 61 families with children aged 2 to 12 months. The intervention was associated with significant improvements in the Developmental Snapshot score and mean z scores for adult word count and parent-child conversational turns, but there were no improvements in mean z score for child vocalization count. Meaning A multifaceted clinic-based approach to promote parent-child interactions holds some promise, but larger studies are warranted to assess effectiveness and broader generalizability.