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

toggle caption M. Elizabeth Fulford/AP

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

toggle caption Anna Kuperberg/www.kuperberg.com