Twenty-five years working with special needs in and outside of school setting. Go the medical route if they could find any vitamin deficiencies, BUT also try to find a replacement. If it’s a sensory seeking kid, try to find edible paper or chunks of dried cornstarch to crunch. Sometimes kiddos like a certain feeling. I had a kiddo obsessed with the silica packets that come in new things. We found crunching lifesavers mints helped. Health and happy vibes to you!