The study is based on Lev Vygotskijs and John Dewey's learning theory. Such is “the zone for immediate development” and “learning by doing”.

Purpose: The study's purpose was to examine how four teachers´ work with bilingual children's language development in a preschool and in a preschool class. These questions will be answered in my study: 1). which view of bilingualism have been the educators? 2). which language development approach has been the educators of preschool/ preschool class have chosen to promote the bilingual children's language development in the Swedish language? 3). what similarities and differences, I find the teachers' way of working with bilingual children?

Method: To investigate and answer the purpose of this study was therefore qualitative approach through interviews are used.

Results: The results show that both teachers in a preschool and preschool class are working with language development in order to encourage bilingual children's language development.

Conclusions: The conclusions are to be able to speak several languages is an asset. Teachers should encourage bilingual children to speak their native language. To encourage bilingual children's language development using a variety of language development methods in the form of music, singing, rhymes and chants. Reading many books and to retell.