J.R.
I don't know what his eating habits are, but maybe he needs to be eating more?? I know that new sleeping habits like this are an indicator that they may need to move to the next step in eating.
I have the Prince Lionheart Slumber Bear and my daughter LOVES IT!! It makes the sound of a heartbeat from inside the womb. It's wonderful and even though mine's younger, I notice huge difference when she sleeps with it. I recommend it to all of my friends now!
Best of luck! :)