The article deals with the problems of forming the language system of the Kazakh (native) language in preschool age. The importance of studying the regularities and features of the formation of components of the language system in the course of speech ontogenesis of children of early and preschool age is revealed. It is emphasized that in the course of scientific research, as close as possible to touch the speech-motor potential of each child, while ensuring not only a tolerant attitude to children's innovations and children's speech style, but also to pay maximum attention to the natural process of mastering the native language and the features of thestructure of the speech-language mechanism.The authors identified effective ways to study and explain the ontogenesis of speech –the process of learning the native language by children. Scientific approaches to the consideration of language phenomena inthe child's speech and the prospects for conducting ontolinguistic research are also identified.

In the scientific article, the authors revealed the social conditions affecting the normal development of a child's language. It was noted that a number of conditions, such as the growing popularity of various gadgets of a modern nature, the predominance of the influence of media products, the problem of mental deprivation, the reproduction of "child bilingualism", hinder the development of a child's speech. Also, the formation of the native language system was considered as the basis for creating a competent language environment. In recent years, the reasons for the increase in parental complaints about the development of speech and the decrease in the scope of language as a communicative tool have been identified and disclosed.