Study of twin births in an urban community of Delhi.
D000328:Adult; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007194:India; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011446:Prospective Studies; D014427:Twins; D014505:Urban Population