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Key terms: age fertility rate women birth baby nrr pp grr cycle cohort males chance try measures pregnancy pregnant decline couples mortality drops assumes online edition varies years old age group fertility rate sharply mothers demography contraception united states when nrr conceive infertility baby boom reproduction ovulation fecundity birthrate baby girls number of children miscarriage period measures each generation within four years standard of living get pregnant within one year will get pregnant within one seminiferous tubules contain mature Search external links cited by footnotes on Wikipedia page Fertility: |
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