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?

As best as possible, try to discuss big topics (e.g. whether to have kids) before marriage. Most importantly, you two need to work to aligning towards common life goals as a unit. I feel that a marriage is where two persons work as a unit towards common life goals. As some have mentioned earlier, life goals may change over time, but what keeps the marriage together is to consistently synchronise your life goals and realign accordingly. In short, just talk it out. :)