On a more serious note though, definitely need to talk through your reasons on why you want another and DH doesn't - DH and I went through this last year. We both had really valid and well thought out logic that was important to us both. Ultimately, there is no compromise in the decision, you cant have half a child. In the end the overwhelming want for DS to have a sibling was the key decision maker for us - both of us had siblings, and we wanted the same for DS.

Honesty and open discussion is the only way - think about how passionately you want another, he may be just as passionate at the other end of the spectrum, but I think respecting each others opinions is the best way to move forward - and understand it might take many discussions to come to a joint decision that you are both comfortable with