that does sound early... Is it a front tooth, which would usually be among the first ones to change? In that case, I guess it could be a very early change, but I have no idea about what the normal and "extreme normal"
boundaries are for that.
However, it also sounds like it could be loose for another reason. Has he fallen on it recently or up to like 6 months ago? Is it grey or otherwise discolored (I think that could be a sign of trauma)? Has he had some kind of infection that could have affected it? Do the gums look swollen?
I've read threads before here where some little kid's tooth would come loose because of a fall, and smilemomma said that that was usually not a problem, because it would grow tight again. But if it's bad on the inside (discolored or decayed), it would probably need treatment ~ but then your dentist would likely have noticed.
Nah, I'd go with the "loose but will retighten" hypothesis for now. And if I were you, I'd definitely wait for what smilemomma has to say on this. She seems to know a little about teeth :LOL (note to self: enter that line into the mdc understatement of the year contest)