Abstract
After gaining its independence, Kazakhstan, like any other post-soviet republics, gained a range of new characteristic features one of which is a Kazakh (autochthon) and Russian bilingual society. The article deals with the problems closely connected with sociolinguistic aspects of child speech formation and its development in bilingual society of modern Kazakhstan. During the process of the scientific work, being a teacher of English, the author of the article has been observing the verbal behaviour of children of pre-schools for the last six years. As a result of the data gained, reasons of lexical interferences’ formation of child speech were cleared out; and the source language/languages of linguistic interferences was identified.