Autism / Autism Spectrum Support Group
Autism is classified as a neurodevelopmental disorder which manifests itself in markedly abnormal social interaction, communication ability, patterns of interests, and patterns of behavior. Although the specific etiology of autism is unknown, many researchers suspect that autism results from genetically mediated vulnerabilities to environmental triggers.
Did he have chronic ear infections as a baby? If so, they may have damaged some of his range of hearing and he may need to see a speech therapist to help him articulate his sounds.
My daughter went through this stage many years ago and I despaired of her ever speaking normally. Now at 25 she talks like any other person, although a bit fast at times.
My "normal" 4 y/o granddaughter had chronic ear infections, necessitating ear tubes. As a result, her speech was delayed, causing her to drop the last sounds of words. I took a lot of time with her, coaching her in the correct way to sound out her words and now she speaks much better.