From what my mother tells me, I did have a slight speech delay, but i did know what other people were saying and therefore knew what they were asking for. As far as remembering when i started speaking, I was maybe 3-4 years old (educated guess). Granted, this was back in the 80s and HFA/AS wasnt heard of until 1994-5, however, i think my mother's mother (who was a teacher) suspected something since i showed similar tendencies to an uncle (whom we are sure had it, even though he never got diagnosed). As far as discipline goes, not sure what to recommend . . . with sensory issues, i demonized my father since he was raised with the paddle, but I dont know what he would have done if I was dxed. All I can say is your son is going to see the world through (likely) quantifiable fact as opposed to emotional (meaning that getting mad at him will likely result in him being confused, and yelling could result in meltdown). So, with rules, you have to explain it and why (example, "Dont touch the stove because it may be hot and burn you.").