As much as it kills me inside to say this, I agree with DaddyLarge.
I know you say you'll have to do most of the work (preaching to the converted there!) but a baby is still a big deal. I don't really understand people who think it's not a major, actually, THE most major event in our lives.
If he doesn't want one, I'm afraid that's that You can discuss it with him and list the pros and cons but ultimately his feelings are just as valid as yours and, unfortunately, this is sometimes a dealbreaker in some relationships. It's just not compatible if one needs to have another child and one needs not to - and both feelings are just as valid as the other.