I'm about to get married and my fiance and I have not talked about having children. I worry about starting this conversation with him - I want many babies and he seems disinterested! How should I do this?

I think in this situation fear or worry of what could happen should be thrown out the window and an honest conversation has to be brought to the table. I would suggest taking him out on an intimate date night, without other people around and no distractions. Focus the night on you relationship and connection with each other. This might help him open up as well and not shut the idea down immediately as he's in a rested state. Do take note that this is just about how you would bring it up, I'm not sure if any of us would be able to help you if the answer is something you don't want to hear. Nevertheless, always keep the channel of communication open. Both parties shouldn't be too caught up on the idea of what they want and instead focus on what makes them stronger as a couple.