text: I could simply be a coincidence.  But you should probably bring it up with your pediatrician at your next visit.\n\nI hope, for your son's sake, that it isn't anything serious.  I am lactose intolerant, and it's really annoying to have to check everything.  Lactose intolerence can actually start as a person gets older.  I didn't have a problem with dairy until I was almost seven.\n\nThe best advice I can give you for right now is to just make sure he's getting plenty of fluids (other than milk) and don't let him have any dairy for a while.  If his symptoms persist, it's most likely just coincidental.