Maybe raising children has become more of a burden than a joy. I know several women who absolutely are not interested in ever becoming pregnant. There is, I suspect, a genuine shift in how this stuff is being dealt with. The poor, for instance, have a higher birth rate than those who are not. Kinda like marriage. Marriage, it seems, is no longer even considered by many. Folks just live together until they don't anymore. How does it it go? Something like; "things are a chang'in"?