Dear Welcome to HCM We understand your concerns I went through your details. I can understand. IQ below 60 is considered mentally retarded (Intellectual disability). As your child psychiatrist diagnosed him as MR (Intellectual disability), that could be surely it. Mental retardation (MR) is a condition diagnosed before age 18, usually in infancy or prior to birth, that includes below-average general intellectual function, and a lack of the skills necessary for daily living. The causes could be Genetic conditions, problems during pregnancy, Exposure to certain types of disease or toxins, problems at birth like not enough oxygen, Iodine deficiency, malnutrition etc. Intellectual disability is more accurately considered a disability rather than a disease. No treatments are available specifically for cognitive deficiency. Although the pharmacologic enhancement of cognition is possible. I request you not to get alarmed. There are many treatment options a dn management options. You should work with the child psychiatrist. You may have to take the help of counselor, psychotherapist, speech therapist and occupational therapist. Most of all, your motivated positive approach is going to be the key. Your child needs your love and care. Love him and care him. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute detail possible. Hope this answers your query. Further clarifications are welcome. Good luck. Take care.