Lexical and grammatical development in Japanese-English bilingual first language acquisition

Children's language learning is characterised by their universal success and the ultimate attainment achieved. In other words, while some variation in the rate of development is documented, all normally developing children become a native speaker of the languages they are exposed to in their environment. There is a similarity in the way they learn their languages. For example, in first language (L1) acquisition studies, children are universally reported to acquire content words such as nouns and proper nouns earlier than verbs (Gentner and Boroditsky 2001). However, there is some evidence to show that children are sensitive to the language-specific features of the input languages.