The aim of this course is to familiarize students with the linguistic development of bilingual (and multilingual) individuals, mainly children, at various levels of linguistic analysis (phonology, morphology, syntax, semantics, and pragmatics). Emphasis is also placed on various types of bilingualism (e.g., simultaneous vs. sequential, balanced bilinguals (2L1s) vs. bilinguals with a dominant language (L1 & L2)), the characteristics of bilingual children (compared to monolinguals), as well as the factors that influence the acquisition of two or more languages by the child (e.g., socio-economic status (SES), biliteracy, etc.). The second part of the course focuses on disorders and learning difficulties identified in bilingual children. Particular emphasis is placed on distinguishing clinical markers of linguistic and cognitive deficits due to disorders arising from bilingualism. Finally, the course addresses potential difficulties that bilingual children face related to their adaptation to the school curriculum, as well as the procedures for their prevention, assessment, and correction.