Tina Nevill of Essex, England, holds Poppy, who was conceived by in vitro fertilization. The U.K.'s health system records all IVF cycles performed in the country. Barcroft Media/Landov hide caption

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Barcroft Media/Landov

Human embryos under a microscope at an IVF clinic in La Jolla, Calif. Sandy Huffaker/Getty Images hide caption

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Sandy Huffaker/Getty Images

Can IVF Treatments Reverse A Woman's Biological Clock?

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Study Suggests Way To Create New Eggs In Women

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