Congratulations to @fucho80!
I am not sure what you meant by "investment" in this context. Are you referring to potential future monetary returns?
I personally think that raising a kid should never be treated as an "investment". I think one should not have any expectations on your kids as a form of revenue stream in the future. I think the older generation (especially Chinese) had this thinking of raising kids for future financial security. That's fundamentally flawed. I think as a responsible adult, one should be planning for his/her own finances to ensure there's sufficient money for retirement. We should not impose additional stress on future generations