A basic question about bilingual development is how the acquisition of one language affects the acquisition of the other. Previous findings are few and mixed. The present study addressed this question with longitudinal data on the dual-language vocabulary growth of 149 US-born children from Spanish-speaking immigrant families, who were followed…

This study investigated developmental pathways between early language and later social skills in a large, prospective cohort consisting of 3387 mother-child dyads. Mediational pathways were examined between parent-reported expressive language (at 2 years of age) and social skills (at 8 years of age), via core language and pragmatic language (at 5…

Over half of US children are enrolled in preschools, where the quantity and quality of language input from teachers are likely to affect children's language development. Leveraging repeated objective measurements, we examined the rate per minute and phonemic diversity of child and teacher speech-related vocalizations in preschool classrooms and…