M.
Hi J.,
Sounds like a very similar situation we went through with my son who had torticollis when he was born. Which meant he favored laying his head on one side versus the other. My son had to wear a helmet for 3 months (originally told 4 months). We were very pleased with the results and my son really had an easy time adjusting to the helmet. Cleaning the helmet was easy, a damp cloth for the outside and rubbing alcohol on a cotton pad or paper towel for the inside.
Good luck.
M.