This paper deals with selective mutism that characterizes up about 1% of early and preschool children and belongs to a large group of special educational needs of children. For this reason, children whose selective mutism is diagnosed, have the right and the need for intensified, individualized, professional, educational and rehabilitative forms of support. In this context, an important role belongs to a child's preschool educator, since in institutional upbringing, children spend a significant part of their childhood, and professional, educational support greatly promotes the proper development of the child, including reducing the symptoms of selective mutism. Various examples of interdisciplinary treatment help positive practice in day-to-day work with children who have selective mutism. Encouraging cooperation of educators with therapists, parents and many other specialists contributes to the child's sense of competence resulting in the acceptance for different methods of interaction with both peers and adults. In other words, a competent educator increases the chances of better treatment through a variety of case studies calling for parental interviews, family opportunities, child developmental status, and observation in everyday play and non-verbal communication. Considering that selective mutism, in a large number of cases, is diagnosed in childhood, the major influence has early intervention, which greatly helps in avoiding later, ongoing disadvantages of communication, socialization and participation in various interactions. Because of the specific difficulties that child have, many educators do not have enough competency and professional experience to ensure interdisciplinary support for each child with selective mutism during preschool education. The purpose was achieved through theoretical elaboration of the topic and case study. The basic outcome of the case study is to describe the process of reducing the symptoms of selective mutism in a preschool aged boy. Thus, the conclusion is related to the better treatment of selective mutism that is achieved only in cooperation with all parts of the profession, which are responsible for the difficulty itself.