Do you guys have similar long term goals?
I agree with others that it needs to be a joint decision. Where are you all headed? It is a lot for a guy to consider having another child, because that puts a lot of responsibility for him to support, provide, etc (I see by your description that you are a SAHM). It is very natural for women to want more children (and for some men), but that does not mean it is an easy thing to do.
I know for my and my husband we talked and planned out things about our marriage while we were dating and most of our goals have been realized now. Of course there are somethings that change, but as a couple you take those as they come. If you don't already have goals together, it would be a good thing, especially for your two year old, to figure out where your family is headed.