title: Some data on natural fertility.
mesh_terms: D000328:Adult; D000367:Age Factors; D001721:Birth Intervals; D005060:Europe; D005260:Female; D005298:Fertility; D006801:Humans; D007246:Infertility; D007564:Japan; D007774:Lactation; D008297:Male; D008875:Middle Aged; D011247:Pregnancy