This final paper research is about language development of preschool children. Central part of this paper is giving the review of developmental stages of speach. Speaking skill is a toll for communicating and better understanding oft he environment. The process of learning how to speak happens in two phases. Nonverbal phase is when children communicate without using verbs. Verbal phase starts when children begin to articulate the sounds and form sentences. Grammatical developement consist of phonological, morphological and synatctic development. Lexical and synatctic development can be seen in number of words that kid knows and how he understands and connects terms. Theories of literature behavioral, nativist, cognitive and sociocultural give us different explanations how children adopt and learn language. Research part oft his paper deals with the ability to pronounce and recognize different words. The main goal oft his paper is to give the review of language development of preschool children. The research included the group of nine children. Results give as a review of different phonological, morphological and lexical development stages in children of different age.