Infant mortality trends and maternal and infant care.
D001723:Birth Rate; D003153:Community Health Services; D006275:Health Facility Planning; D006761:Hospitals; D006801:Humans; D007224:Infant Care; D007226:Infant Mortality; D008427:Maternal Health Services; D008429:Maternal Welfare; D012959:Socioeconomic Factors; D014481:United States