Maternal health and mongolism.
D000293:Adolescent; D000328:Adult; D002869:Chromosome Aberrations / Q000209:etiology; D025063:Chromosome Disorders; D004314:Down Syndrome / Q000453:epidemiology / Q000209:etiology*; D005260:Female; D005306:Fertilization; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008404:Massachusetts; D008423:Maternal Age; D008429:Maternal Welfare; D011247:Pregnancy; D011248:Pregnancy Complications; D013312:Stress, Physiological; D014314:Trisomy