This paper sets out to render young children’s beliefs about language and bilingualism as they are ponounced in child-adult interactions. The data stem from Swedish-medium preschool units in three distinct sites in Finland. The results display that children’s beliefs of bilingualism are that you should use one language when speaking to one person; that languages are acquired through use; and that the benefit of knowing more than one language is being able to talk to (other) people. The results also display that this knowledge of languages is not different from other knowledge within their world. This will probably alter over time as the children enter school, and it is something in which the presence of language researchers will have played a role.