Social class and infant mortality.
D004522:Educational Status; D005060:Europe; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007223:Infant; D007226:Infant Mortality / Q000639:trends; D007231:Infant, Newborn; D011247:Pregnancy; D012923:Social Class; D014481:United States