I suppose if you are figuring out that the guy you're with may not be for you, then that should nix the idea of kids (at least with *him* and at least for the short-term).
I think if someone really wants a child, they will find any excuse to bring them into the world, regardless of the state of the planet, etc. That's not saying that's not selfish on their part.
I think ultimately, after one thinks it over properly, that a woman should decide to bring a child into the world who acknowledges that she can and will become selfless and has the urge to raise a new life and to see it thrive, no matter the foreseen or unforeseen challenges.
Anyone who wants a kid because they just 'want one' is too selfish to have a child, because they are do it because *they* want it.
A child needs the backing and the support and the selflessness and 110% from both parents; anything less than those things assured that child, will not be sufficient.
Julie