Kidd and Garcia (2022) report that language acquisition studies are skewed towards monolingual and English-speaking populations. This commentary considers Kidd and Garcia's arguments in light of our research on mother-preschooler discourse and non-verbal communication in Thai monolingual and Thai-English bilingual children. We discuss lessons learned from testing linguistically diverse children and underscore the importance of research on non-WEIRD populations. We advocate for the inclusion of children who speak understudied languages and those who speak multiple languages in developmental science.
Keywords: bilingualism; child language acquisition; cross-cultural; cross-linguistic; mother-child dyads; narrative discourse; non-verbal communication.