Abstract. The proverb “Who knows the language knows the people” has found its confirmation today. A striking example of this is the fact that foreign languages are mastered right from preschool age. Parents gradually understand that it is necessary to involve children in languages from preschool age. To date, it has been proven that preschoolers learn two languages in parallel, this is one of the tools for their mental development. This article includes such issues as scientific research on the formation of bilingualism and the stages of its development.