Language, socialization of culture and persona, origination of infantile speech and its phases of forming, observation of communication abilities of child in different communicative situations, beginning of communication of child with peers and adults, communicative features of child in game-communication environment have been stated in this article. The activity of a baby, who just started communicating with the environment, who is going through socialization process, is based on imitation of people around him/her. During communication a child expresses by different actions, gestures and sounds. The development of child’s speech depends on the environment and surrounding. A number of social, psychological, and cultural factors influence child’s language performance. There are active and passive communications of child’s vocabulary. The active vocabulary consists of words and phrases used in daily life. The passive vocabulary consists of the concepts and imaginations which are understood by a child, but she/he does not express them by words. The language competence of a child is defined by his/her behavior in different speech situations, and how well can she/he express his/her thoughts. Naturally, the influence of cultural environment is important.