Isa-
LOL, it's normal for my kids, they all have craved near-constant interaction since birth. I think they just have a tremendous need for "input".
Mine DS11 was that way too. Every year it gets easier. A little. I have stopped worring about who's "fault" it is. I just remember that he has special needs, and that can be hard on a Mom. Some kids just do. And yes, I have tried everything, and it all worked, a little. Still not a normal situation. Where are those "rent-a-siblings" I keep dreaming of? I couldn't even organize a "rent-a-granny."
Interestingly, at day care, My DS had a pattern of choosing "One best friend" and insisting on playing "only" with that kid. If the child felt like playing with him, it was a good day. If that child wanted more space, it was a bad day. He was also really good at "monopolising the teacher's attention." This was seen as "his problem" and a sign of "immaturity." And I should please stop paying so much attention to him at home so that he wouldn't have this "problem." This was followed by, "Well, you probably can't help it, him being an only, and you being so old when you had him and all." I hate other people sometimes. Or maybe just their behavior. Although now I am actually laughing, because it's funny.
Looking back I wonder if putting him with the older group would have eased some of that "input deficiet" but I think that for some children, it is just going to be a need when they are small.
High Urge to learn, Lower physical ability to get information equals "special need" behavior.
And that's the truth
Trinity