This happened to my DD in 1st and 2nd Grade with two different kids. The teachers sat my DD next to the "stinkers" in hopes that her good behavior would wear off on the other kids. The only thing that did was distract DD and she would constantly worry about the other kid getting in trouble. Eventually, one of the kids who could not sit still constantly hit and bumped her. That same kid ended up in her 3rd Grade class and I requested that my DD NEVER be sat next to this kid again. My only regret is that I did not do it much sooner!
I would suggest that you speak with your son's teacher and request that your son be moved away from this child immediately.
