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MARGARET WARNER: We turn to new guidelines and questions surrounding freezing eggs to treat infertility.

Doctors started freezing and then thawing eggs for in vitro fertilization, or IVF, years ago, but in very few cases, and the procedure has been considered experimental.

Today, the American Society for Reproductive Medicine shifted its position, saying the process shouldn't be labeled experimental any longer. It said babies born from frozen eggs are as healthy as those from fresh eggs. But the committee said the procedure should be limited in its use.

It's estimated there have only been about 1,000 births from frozen eggs, compared to nearly five million babies born through traditional IVF.

We look at what's changed and the thicket of questions it raises now with Dr Eric Widra. He co-chaired the committee that made the recommendation change. He's with the Shady GroveFertilityCenter.

And Marcy Darnovsky is the associate executive director of the Center for Genetics and Society in Berkeley, Calif.

Welcome, both of...