title: Context-related age changes in mothers' speech: joint book reading.
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007804:Language Development; D008297:Male; D009034:Mother-Child Relations; D011932:Reading; D012660:Semantics; D014705:Verbal Behavior; D014825:Vocabulary