This study of 148 Bulgarian children with mild intellectual disabilities investigated the incidence of various types of speech and language disorders in children with intellectual disabilities. A questionnaire was given to the parents and relatives of the children requiring information about the pupils' pre-, peri-, and early postnatal onthogenesis. The children also underwent a battery of diagnostic measures designed to measure fluency, rate, articulation, voice, respiration, language, and motor skills and academic skills. Results found various types of speech, language, and fluency disorders in 121 of the children, including: writing, reading and arithmetic problems; cluttering; stuttering; voice disorders; and articulation disorders. The report describes the incidence of each of the speech and language impairments found, and the factors involved. A diagram of the dissemination of the speech and language disorders in the children is also provided. (Contains 18 references.) (CR)