Many club foot babies appear to have the desire to sleep on their side in common. During the casting process this is easy to do, but once the leg braces are on it is near impossible. Lately I have been using our boppy pillow to prop her up on the side and she loves it! Boppy's are not meant for children to sleep with, so use at your own risk.
With my son we just propped him against the side of his sleeping area. Worked okay too!
What tricks have you used?