By the numbers...
D003267:Contraception / Q000706:statistics & numerical data; D005260:Female; D005306:Fertilization / Q000502:physiology*; D006282:Health Personnel; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000453:epidemiology