I noticed something was different about my son at 3 months of age. I thought he may have been hearing impaired. So, I tested it out by standing on each side of him with his rattle. Each time, he responded on the appropriate side but his eyes looked like he was just somewhere else and not with me. Something just wasn't quite right. He's almost 19 now and I remember that day like it was yesterday. He no longer has that look about him. It went away at puberty.
Personally, I don't believe that shots cause aspergers or autism. I believe that people are simply changing.