In the top drawer of my desk, I keep [a picture of my son]. This picture was taken on September 7, 1993, 24 weeks before he was born. The sonogram image is murky, but it reveals clear enough a small head tilted back slightly, and an arm raised up and bent, with the hand pointing back toward the face and the thumb extended out toward the mouth. There is no doubt in my mind that this picture, too, shows [my son] at a very early stage in his physical development. And there is no question that the position I defend in this book entails that it would have been morally permissible to end his life at this point.
— David Boonin, A Defense of Abortion (Cambridge: Cambridge University Press, 2003), xiv