title: Early maternal linguistic environment of normal and Down's syndrome language-learning children.
mesh_terms: D002675:Child, Preschool; D004314:Down Syndrome; D004522:Educational Status; D005260:Female; D006801:Humans; D007182:Income; D007804:Language Development; D009034:Mother-Child Relations; D013997:Time Factors; D014705:Verbal Behavior