I don't think it's pretentious. I think it's helpful for anyone in a similar situation -- I too have a kid and another on the way. If it's irrelevant to you, it's clearly marked and easy to ignore.

He's offering tips for balancing work/home life, which is a difficult task for many "hackers" and entrepreneurs who have a drive to be successful and important. It's not rocket science, it's not really helpful to me, but what about it is pretentious? I'm assuming if he was a mechanic or secretary it'd no longer be pretentious?