My 14mo DS often hits himself on the head or uses a hard plastic toy to hit his own head. It seems fairly hard! He will got on his forehead or the side of his head. He is otherwise in good health but quite wriggly and fidgety, and generally curious and active. In case it's relevant he has recently cut his front teeth and doesn't have any signs of ear infection etc, this has been going on a few weeks. Anyone had similar and any idea if this behaviour is normal?!