Further Research
There is currently no differentiation of normal and deviant bilingual development.
Further study into the effects of changing a child’s linguistic environment could uncover the minimal language input required to maintain "active use potential" in a particular language.
Simultaneous trilingualism is also possible. There is significantly less research in this area than in simultaneous bilingualism. However, trilingual language acquisition in young children has been shown to generally mirror bilingual acquisition.
Read more about this topic: Simultaneous Bilingualism
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