[Fertility survey of different birth cohort women in Beijing city].
D000328:Adult; D000367:Age Factors; D000368:Aged; D001721:Birth Intervals; D001723:Birth Rate; D002681:China; D005193:Family Planning Services / Q000639:trends*; D005260:Female; D005298:Fertility; D049673:History, 20th Century; D006801:Humans; D008875:Middle Aged; D011247:Pregnancy; D013245:Sterilization, Reproductive; D011795:Surveys and Questionnaires