This article examines the stages of children's first language acquisition. The aim of the article is to provide a detailed analysis of the development of children's speech, from birth to the time when they are able to speak fully. The study used scientific sources from the fields of linguistics and psychology. The main results show that children learn language in several stages: the pre-linguistic stage (0-6 months), the one-word stage (12-18 months), the two-word stage (18-24 months), and the later stages, when grammatical rules begin to form. At each stage, children acquire certain speech skills, and these skills become the basis for further development. The conclusion of the article is that understanding the process of children's language acquisition is necessary for parents and teachers to support children and develop their speech skills. Providing children with a language environment, talking to them more, and reading books can help their language development.