Significant differences in language and self-regulation skills exist among children when they enter formal schooling. Contributing to these language differences is a growing population of dual language learners (DLLs) in the United States. Given evidence linking self-regulatory processes and language development, this study explored bidirectional associations between English expressive vocabulary and self-regulation skills for monolingual English and DLL preschool children (N = 250) from mixed-income families in Los Angeles. Across three time points, findings provide initial support for bidirectionality between these developing skills for both monolinguals and DLLs. Results provide strong empirical support for vocabulary serving as a leading indicator of self-regulation skills in preschool. Findings also suggest that early self-regulation skills play a particularly important role for vocabulary development.

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This study examined whether children's observed individual engagement with teachers, peers, and tasks related to their school readiness after controlling for observed preschool classroom quality and children's baseline skills. The sample included 211 predominately low-income, racially/ethnically diverse 4-year-old children in 49 preschool classrooms in one medium-sized U.S. city. Results indicated that children's positive engagement with (a) teachers related to improved literacy skills; (b) peers related to improved language and self-regulatory skills; and (c) tasks related to closer relationships with teachers. Children's negative engagement was associated with lower language, literacy, and self-regulatory skills, and more conflict and closeness with teachers. Effect sizes were small to medium in magnitude, and some expected relations between positive engagement and school readiness were not found.

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