THE TIME INTERVAL FROM THE WEDDING TO THE BIRTH OF THE FIRST CHILD.
D001722:Birth Order; D002648:Child; D005260:Female; D005387:Finland; D006801:Humans; D008393:Marriage; D036801:Parturition; D011247:Pregnancy; D014798:Vital Statistics
BIRTH ORDER; FINLAND; MARRIAGE; PREGNANCY; VITAL STATISTICS