Shifting age-parity distribution of births and the decrease in infant mortality.
D001722:Birth Order; D001723:Birth Rate; D002662:Child Health Services; D005193:Family Planning Services; D005260:Female; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D008423:Maternal Age; D008427:Maternal Health Services; D010298:Parity; D011247:Pregnancy; D013223:Statistics as Topic; D014481:United States