In some parts of the world, that sex selection for boys - and it's usually for boys - reflects sex discrimination against girls, and it leads to very large imbalances - in China, in Korea, in India - in the population between boys and girls, a vast disproportion of boys to girls, and it reflects really this discriminatory attitude toward girls.

The other effect that I worry about is the effect on the parent, that the moral teaching of humility and of the limits to our control that parenthood teaches- - that that will be lost and that we will begin to think of children more as consumer goods than as gifts that we can't fully control and for which we aren't fully responsible.

There are really exercises in a kind of consumerist ethic that I think don't have the same moral weight as medicine or health.

Aiming at health, restoring health - that is a goal that is both morally important and limited, because it aims at the restoration of normal human functioning, which is an important part of human flourishing.

If we go too far down the road of choosing the genetic traits of children, my worry is that parenting will be less a kind of school for humility than it should be, and we will become too accustomed to regarding children as instruments of our ambition and of our desires.

I think people who want to use genetic technologies to gain a competitive edge for their children are engaging in a kind of overreaching that could really undermine our appreciation of children as gifts for which we should be grateful and, instead, to view them as products or instruments that are there to be molded and directed.

It is true that the Jewish tradition emphasizes the moral mandate to save life. It also has a different position from the Catholic Church on the moral status of the embryo. It has a more developmental view of when human life, in the sense of personhood, begins than does the Catholic Church.