Trends in breast-feeding.
D000293:Adolescent; D000328:Adult; D001942:Breast Feeding; D003625:Data Collection / Q000379:methods; D003710:Demography; D004522:Educational Status; D004651:Employment; D005006:Ethnicity; D005260:Female; D005298:Fertility; D006801:Humans; D007223:Infant; D007225:Infant Food; D007231:Infant, Newborn; D008875:Middle Aged; D014481:United States