I kind of undertsand where you are coming from cause the same thing has happened to us - wanted 2 then 3 now thinking 2 but still not really sure...it's a weird feeling. My honest and first reaction is however not to try too hard to convice him because if you talk him into it and then it happens it could be a recipe for disaster. In saying that I think you can still explain the positives:

- great Christmas's with lots of kids therefore bigger family holidays in the future (more aunties and uncles)
- Each of your kids has 2 sibling not one so more fun/chaos etc.

I actually think it's quite hard to say reasons why - you just know that having kids are greta and they come with good and bad. I know if we have a third it will be just as loved as first 2 but I do think practically about having 2 not 3. I think I have just rambled rather than giving you an anwer - sorry!!