Nutritional intervention in pregnancy.
D000293:Adolescent; D001724:Birth Weight; D001835:Body Weight; D004032:Diet; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D009747:Nutritional Physiological Phenomena; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D011295:Prenatal Care