title: Some observations concerning premeaningful vocalizations of hearing--impaired infants.
mesh_terms: D002663:Child Language; D002675:Child, Preschool; D004314:Down Syndrome / Q000503:physiopathology*; D006311:Hearing Disorders / Q000503:physiopathology*; D006801:Humans; D007223:Infant; D007804:Language Development; D014705:Verbal Behavior