I've just finished reading Lionel Shriver's
Double Fault, where the issue of children crops up (albeit fairly briefly). I was struck by what the female protagonist says when she is urged to replace her waning tennis career, and lack of a purpose, with a child: "I can't have a child as a substitute for a life." Unfortunately some parents seem to have children precisely for that reason, an arrangement which strikes me as unhealthy for everyone involved.
Lionel Shriver is, of course, famously childfree; see
here for an interesting article she wrote on the topic a couple of years ago. To anyone who has not read her previous book,
We Need to Talk About Kevin, I would heartily recommend it - it's a pretty terrifying antithesis to parental propaganda.