I'm thinking along these lines as well...
My SO and I have openly talked about marrying one another BUT the baby issue is...well, an issue. I don't want one NOW (and honestly not 100% sure I want one ever.)
Because he's 10 years older and already has a child, he doesn't care either way, to have or to not have. My biological clock is ticking and I'm heading towards 40. However IF I do decide to have a child, he'd prefer to have one ASAP and as for me, I'd rather hit a certain financial comfort before having a child. We can def. afford one now, but for whatever reason, I want to afford one on my own salary....juuuuuuust in case. :S