The relationship between parental age and birth order with the percentage of low birth-weight infants.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001722:Birth Order; D001724:Birth Weight; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D008875:Middle Aged; D010290:Parents; D011247:Pregnancy