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guideline CG156". "How regular is regular? "Relative Weight and Race Influence Average Age at Menarche: Results From Two Nationally Representative Surveys of US Girls Studied 25 Years Apart". Retrieved 1 maint: Archived copy as title ( link ) Creinin, Mitchell.; Keverline, Sharon; Meyn, Leslie. There is also subfecundity in the weeks following childbirth, and this can be prolonged for a year or more through breastfeeding. "Introduction: evolutionary theory and the search for a unified theory of fertility" (PDF).

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Net Reproduction Rate (NRR) - the NRR starts with the GRR and adds the realistic assumption that some of the women will die before age 49; therefore they will not be alive to bear some of the potential babies that were counted in the GRR. International Journal of Fertility Sterility. Peak fertility occurs during just a few days of the cycle: usually two days before and two days after the ovulation date. "Cross-National Patterns of Intergenerational Continuities in Childbearing in Developed Countries". This article is about fertility in humans. "The Evaluation of Infertility".

"Increased Infertility With Age in Men and Women". Isbn Bock J (2002). Journal of Data Science. From Private Vice to Public Virtue: The Birth Control Movement and American Society Since 1830.