I'm curious about these studies, how they measure happiness, and the possible confounding factors. I was really happy before kid (singular), and I'm still really happy. Happier, I think, then I would have been otherwise? I don't really know how to measure that.

As a not-yet-made-it startup guy it definitely feels like playing on "expert mode". But with a supportive partner and some careful life choices, it feels pretty good. It helps that my cofounder has a kid almost the same age as mine, and we've been going through this together.