Quoting Mama Rice:" I never, ever thought I would say this since I have my DD and my DS but I WANT ANOTHER BABY (caps words ... [snip!] ... my DS we were done and his opinion hasn't changed. How did you cope with baby fever when your DH is certain that he is done?"
Rape him and get pregnant anyway.
No i'm kidding lol.
Sit down and have a serious talk with him about it, that's about the best thing you can do. I'm having horrible baby fever but I already have two at 21 so I think i'm going to wait a little while.