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Surrogate Whitney Watts had her son, J.P., while her husband, Ray Watts, was at sea with the Navy. Surrogacy experts say it's crucial for surrogates to have their own children because they'd presumably understand the emotions involved in bearing a child. The couple for whom Whitney carried twins paid for all expenses during the pregnancy, including private health insurance. Marisa Peñaloza/NPR hide caption

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William Stern holds his daughter, then known as Baby M, in 1987. The Sterns' surrogate tried to keep the baby after she was born. Their court battle became the first public debate about surrogacy. M. Elizabeth Fulford/AP hide caption

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Kate Donnellon Nail, 43, works out regularly and eats well. She never thought she would have a problem conceiving a child. Anna Kuperberg/www.kuperberg.com hide caption

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Ultrasound scan of twins at 4 months. Getty Images hide caption

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