My brother, Dr Bob, is specializing in treating children with autism. He addresses the many metabolic “quirks” that these children can have. He has had good success in improving these kid’s symptoms. While there are still many unknowns in regards to autism, there seems to be an autoimmune component. This is when the body’s own immune systems does not function properly and attacks the wrong cells in the body. When a person has an autoimmune problem, the thyroid gland can get attacked, causing an abnormal thyroid level. A child with suspected autism should get his thyroid hormone levels checked, in addition to many other metabolic studies. A doctor that is familiar with treating autism and metabolic issues can help with this. Here is a link to a page of advice on finding a quality practitoner: https://www.autism.com/treating_finding
Dr. Jim