My 4 y.o. DS has started to become really shy whenever we go to new places. He's always been a bit clingy for a few minutes, then once he feels comfortable he's off, in his usual whirlwind manner. But on the last 3 occassions (both adult & child gatherings), he has been clingy for an hour or more. I don't want to distress him by pushing him into situations that make him uncomfortable, but I don't want to pander to this new insecurity, so that it becomes a habit. Any ideas on how to overcome this?