Many people around the world, including Canadians, grow up learning more than one language. The Bilingual and Multilingual Development Lab at the University of Toronto focuses on those who began learning two or more languages from the time they were born and on those who began learning a second or third language upon starting school. While research on bilingual/multilingual development is definitely expanding, little is known about what is typical of bilingual or multilingual acquisition. In the short-term, our findings contribute to existing theories of multilingual language and cognitive development and, in the long-run, will help to develop appropriate clinical diagnostic and intervention tools for a wider range of populations, including bilinguals and multilinguals.