From the moment a baby girl is born, her fertility clock begins the countdown. Though she has millions of eggs in her immature ovaries, by the time she's a woman, the viability of those eggs has already started to diminish. By age 40, her chances of conceiving have declined, while her chances of having a child with chromosomal abnormalities have increased. And if she's like thousands of women in their 30s who have yet to meet Mr. Right and whose careers and personal choices don't include, for now, child rearing, she may find herself wishing that should could freeze time....