Hi, we moved when our first daughter was nearly two and I was 8mnths pregnant! (bad move)
It's always stressful so can you leave your boy with a trusted friend or grandparent on the day of the move? Try and have his room set up first, and unpack his things, getting out his favourite toys etc. This will help make the transition a little smoother for him, also the more you can do to help yourself from getting stressed, the better as kids do pick up on your emotions. Think about things like kitchenware/items you'll need to prepare bottles or feeds for him, make sure you have these ready to go before bringing him into the situation so it runs as smoothly as possible for you both.
Dizie, 2 girls, 2002 & 2003