Multiple births in Australia, 1944-63.
D000328:Adult; D000367:Age Factors; D001315:Australia; D001722:Birth Order; D001723:Birth Rate; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008423:Maternal Age; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012737:Sex Factors; D014310:Triplets; D014427:Twins