title: Maternal age and Down's syndrome.
mesh_terms: D000328:Adult; D000649:Amniocentesis; D004314:Down Syndrome / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D006801:Humans; D008423:Maternal Age; D008875:Middle Aged; D011247:Pregnancy; D012306:Risk