Eggs may be more vulnerable to freezing than embryos, but that's just one factor that affects the odds of having a baby with frozen eggs. Jean-Paul Chassenet/Science Source hide caption

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In the technique known as intracytoplasmic sperm injection, a fertility specialist uses a tiny needle to inject sperm into an egg cell. Mauro Fermariello/Science Source hide caption

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Along with sperm, the in vitro procedure adds fresh mitochondria extracted from less mature cells in the same woman's ovaries. The hope is to revitalize older eggs with these extra "batteries." But the FDA still wants proof that the technique works and is safe. Chris Nickels for NPR hide caption

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Fertility Clinic Courts Controversy With Treatment That Recharges Eggs
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A healthy baby still tops women's wishes for their future children, but intelligence and athletic skill are gaining importance. Claire Fraser/ImageZoo/Corbis hide caption

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A technician opens a vessel containing women's frozen egg cells in April 2011 in Amsterdam. AFP/Getty Images hide caption

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Silicon Valley Companies Add New Benefit For Women: Egg-Freezing
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Sperm are placed inside the egg with a needle during a fertility treatment called intracytoplasmic sperm injection. iStockphoto hide caption

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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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Doctors use tissue slides like this one of the ovary's outer cortex to confirm a woman's ovarian reserve. It's also the the ovary tissue that's removed in an ovarian transplant. Courtesy of the Infertility Center of St. Louis hide caption

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Chance To Pause Biological Clock With Ovarian Transplant Stirs Debate
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Human embryos under a microscope at an IVF clinic in La Jolla, Calif. Sandy Huffaker/Getty Images hide caption

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Freezing Eggs To Make Babies Later Moves Toward Mainstream
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Each of these mouse pups was born from an egg scientists created using embryonic stem cells. It's possible the technology could change future treatment for human infertility. Katsuhiko Hayashi hide caption

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Scientists Create Fertile Eggs From Mouse Stem Cells
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Eating foods high in saturated fat may increase fertility problems in men, a preliminary study finds. Robert Byron/iStockphoto.com hide caption

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Alvaro Heinzen/iStockphoto
Study Suggests Way To Create New Eggs In Women
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While talking with the media outside the Exciting Idlewild Baptist Church in Lutz, Fla., on Sunday, former House Speaker Newt Gingrich called for a commission to look at new rules for clinics that perform in vitro fertilization. Matt Rourke/AP hide caption

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