Laugh. That was all I could do. It wasn't hysterical laughter, more like a nervous laughter, but not quite that either. My wife had just told me that we are expecting our fourth child. I was content with two, but she had wanted a third. No problem, and the third has been wonderful. But neither of us felt that our lives were lacking without a fourth. In fact, we had been filling out our mental checklist, putting a check beside each phase that we would never have to go through again: middle-of-the-night feedings, diapers, sleep schedules. The usual things.