Tonya, I don't know much about this at all so take this with a grain of salt, but I wouldn't put a mirror in front of him and show him how bad they look. That'll probably make him more self-conscious and stressed and further intensify his behaviour.

Are you happy with the therapy he's getting? Maybe another child psychologist might help. Just thinking, is this new behaviour? He might be carrying some additional stress about his little brother coming into the world and how it'll impact on his place in the family. I know you are the coolest mother on earth though so it's probably not that, but he must be concerned about something that's affecting him.

{{{hugs}}} to you both.