In Italy and Japan, among the 80 percent or so of women who do still have children, the one-child mini family has become the new social norm. This, too, is a modern lifestyle choice. "It's the minimal family that lets you off the hook from parents and social expectations, but exacts the least burden on your lifestyle..."
More and more Western couples are choosing not to have kids, as readers of my blog know since I harp on this all the time. If you're interested, check out this Newsweek article.
Hat tip: Mr. Crunchy Con