Other questions relevant include assesement of Child's muscle development and playing, ability to recognize parents and other Children in the house, ability to hear. Also if the child can be taught sign language meanwhile depending on his ability. You need a psychologic assesement and also an early childhood development specialist.This is an integrative effort involving many people. Most states have these facilities and interacting with your physician and school system would provide this assistance. All these programs are covered by insurance and government. You could also have the hospital records of the addmission reviewed. Has the Child had any genetic tests using the blood and saliva.