There are two kinds of parents in the world. There are those who strive to re-create for their children the blissful upbringings that they themselves once knew. And then there are the rest of us. But somewhere in the quest to make childhood a safer, happier, more secure place, parenting -- and specifically, motherhood -- became a highly competitive field. And as two recent, much forwarded features reveal, that zeal is not just driving parents crazy, it might not even be so great for the kids.