It's not only us commoners who are wondering whether to have kids or not...

Even the Royals have to struggle with the decision to have a child or not!  To be fair, it's mainly a 'now or later' decision for them but interesting to see how the issue of career has impacted their decision to have children.
http://www.nowmagazine.co.uk/celebrity-news/536613/prince-william-is-forced-to-make-tough-decision-about-his-future-with-kate-middleton.html