Factors in the unprecedented decline in infant mortality in New York City.
D000032:Abortion, Therapeutic; D000293:Adolescent; D000328:Adult; D001723:Birth Rate; D001724:Birth Weight; D005006:Ethnicity; D005191:Family Characteristics; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008423:Maternal Age; D009519:New York City; D011247:Pregnancy; D012959:Socioeconomic Factors