J.C.
Hi! I believe that some kids develop a sort of "tick" that they eventually outgrow. This is just my opinion though. My sister used to stretch her mouth out like a yawn all the time when we were little. My brother, who is now 10, makes this little coughing noise all the time that drives me nuts. I think that sometimes it may just be because they're bored, or maybe a little shy and it gives them something to do to distract them from those anxious feelings that shy people get when other people are around. Who knows....I'm just saying that it may not be anything, so try not to worry about it too much while you're waiting for him to see a doctor.