Three generations of parents.
D001723:Birth Rate; D003267:Contraception / Q000379:methods; D003710:Demography; D004522:Educational Status; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D006801:Humans; D010290:Parents; D011247:Pregnancy; D012922:Social Change; D012959:Socioeconomic Factors; D014481:United States