DS1 recently moved up a room at nursery, to pre-school, and has been upset when we drop him off in the morning. Prior to this he would run in without looking back, so the move has clearly knocked his confidence. He's apparently always fine within a couple of minutes of us going, he loves being there and when we pick him up he doesn't want to leave!
The nursery suggested a reward chart for not getting upset at drop-off. He's responded well to a chart before, but I'm not sure it's right to tell DS he needs to not get upset in order to get a reward if that's how he really feels!