So many young mothers and fathers face this struggle, no matter who in the relationship wants the additional kids. It's always sad to watch from the outside, because both parties are in pain, believing they are not understood or heard. But sometimes it's possible to come closer to peace and understanding by two means:
1. Stand in the other person's shoes for awhile. Find out what it means to them to have another child in terms of their own longings, their view of the future, the ideal pictures in their heads, their fears and concerns. I think it's easy to see how a man would be completely out of order to insist that his wife have another child if she didn't have the stamina, energy, heart, or other heroic resources for it. It is so much harder for women to understand that for a man, especially a responsible one, the thought of another child can be just as overwhelming (particularly in these uncertain economic times.)
2. Practice mindful, deliberate appreciation for what is already available to us. This takes us out of our histories, out of the past, and out of a future which may never arrive. It puts us squarely into our lives. We usually discover there is so much richness right here that our longings, fears and hopes become far less significant. Happiness and satisfaction increase exponentially. And living in a wished-for future blinds us to how much joy and sheer amazement exist now. Now is the only moment that is real, and too often our thoughts and desires keep us from experiencing it.
There are always reasons to have another child. There are as many reasons not to have another. If your discussions with your husband don't make it past reasons, probably the best you'll be able to do is compromise, which is, unfortunately, another way to describe a win/lose situation. I sure wouldn't want to be a win/lose baby. I hope you can find a way to be content with however many children you have.