No, it wasn't; there was absolutely no reason for him to reposition himself in front of the camera temporarily to show us that he's laughing. We know, we can hear it. There's nothing natural about that.
I, too, felt that the big quasicomfortable smile was unpleasant and detracted from the video. But the kid is cute and the issue is important, so I will (in my grand benevolence) overlook it.