How Old Is Too Old?

Jonie Mosby Mitchell is three months pregnant and thrilled about it. She and her husband adopted a baby girl three years ago, and they are eager to produce a sibling for her. Nothing unusual about that, except for the fact that Mitchell is 52. She went through menopause years ago.

Mitchell's pregnancy represents one of the latest and most extraordinary achievements of infertility science. By treating his middle-aged patient with hormones, Dr. Mark Sauer, at the University of Southern California, was able to essentially reverse the effects of menopause. Using an egg from a young woman and artificial insemination with sperm...

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