@ Portia, not sure what you mean by his response to processing sounds. You mean his speech? He is extremely well spoken and we are told this by just about everybody. His vocab is amazing and he converses very much like an adult.

OR do you mean processing sounds he hears like loud noises? He doesn't really like loud noises, covers his ears a lot when things are loud and flinches. I am the same way, very volume sensitive probably more so then he is.