Language separation and intermingling in young children's bilingual environments and their effects on children's dual language development and use

The current study addressed several questions about the use of language intermingling in child-directed speech and its influence on children's English and Spanish language acquisition on children's language code-switching, Participants were 65 children (Mean age=30.93 months, SD=0.44, 28 boys and 37 girls) who had been exposed to English and Spanish from birth and for whom at least one parent was a native Spanish speaker.... Measures of the children's lexical, grammatical, receptive, and productive language development in English and in Spanish were collected concurrently.... Consistent with sociolinguistic theories that propose that language separation is necessary for heritage language maintenance, children who were exposed to more language intermingling were more English-dominant. Both sensitivity to the language context and children's language dominance were related to children's production of mixed utterances. Children code-switched more when speaking in their less proficient language and when in the context of minority language use.