This paper presents research on the prevalence of the native language of Sukošan in the preschool institution "Zlatna lučica". The paper consists of three parts or chapters. The first part of the paper contains a brief overview of the process of standardization of the Croatian language, and highlights the most important and well-known moments. Terms that are explained are many dialects of the Crotatian language that are native to Sukošan, a presentaion of Sukošan and its history and dialectal location of speech. The second part of the paper contains a brief development of speech of children of early and preschool age, and lists the main features and stages of development of children's speech. Factors influencing the development of speech in children, the influence of parents on speech development, the influence of educators in speech development, the use of native language in educational institutions and the importance of preserving native language are highlighted. The third part of the paper contains a review of research aimed at determining how much of Sukosan's speech is present in preschool children and how many children actively use certain words. In this part also presented is the research methodology, goals, tasks and hypotheses of the research, measuring instruments, method of implementation, research results and conclusions arising from the research are presented.