baby fever..

Hi everyone!! Well, I'm 22 and I have extreme baby fever. I literally think about it everyday. My boyfriend already has a son from a previous relationship and isn't ready for another one. He doesn't want one until after being married for at least a year. I understand completely, but it still doesn't change the fact that I still want one very badly and I don't know what to do because I feel so incomplete and sad at times. I am financially stable, but it's just my boyfriend who isn't ready. We have been together for two years and I know we want to get married, but it doesn't seem like anything is happening.