It is known that a healthy child's language development and its psychomotor development show parallelism. With the coordination of the muscular movement and the sensory organs the base for the cognitive and language development is given. But, in addition to hypotonic reasons that stunt the development of the muscular system in the children with Down's Syndrome, other factors, such as the late school age, negatively affect their cognitive and language developments. However, information about the "Multidisciplinary Preschool Program for Down's Syndrome Children at the University of Washington (Seattle)" and researches at "Sevinç Private Education and Rehabilitation Center for Cognitive Handicapped Children (K.Maras)" have shown that an immense progress in the language and cognitive development of Down's Syndrome Children can be recorded if their education is started in earlier months after the birth and parents are included in the educational process.