I have a 15 month old son who when crawling tilts his head over towards his right shoulder. Friends and family thinks he’s just being playful, but I’m wondering whether or not it could be something more to look into.

Sounds like he’s playing. There is a conditon called torticollis, where a child will not want to tilt his head to the opposite side because of severe pain. If he can freely move his head to both sides, then it is not torticollis. An exam by your child’s doc would be helpful. Sincerely, Mike