Billboards alert parents.
D001741:Black or African American; D002675:Child, Preschool; D006266:Health Education; D006293:Health Promotion; D006311:Hearing Disorders / Q000517:prevention & control*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007806:Language Disorders / Q000517:prevention & control; D010290:Parents; D010865:Pilot Projects; D013064:Speech Disorders / Q000517:prevention & control; D014481:United States