[Speech development in children. (2). 1. Speech development in mentally retarded children].
D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008607:Intellectual Disability; D007804:Language Development / Q000209:etiology*; D013060:Speech; D013064:Speech Disorders; D013637:Tape Recording; D014825:Vocabulary; D014831:Voice