I think some of the most eye opening comments in that thread are the dads talking about the toll a second kid took on their marriage. Some of the marriages became worse and others ended in divorce. I can see how that can happen as there's stressful moments with 1 kid let alone two. If my wife and I had less time for each other, less time for ourselves, and more stress that comes with 2 kids it would easily stress our marriage to it's max.