my 8 mth old DS has been shaking his head from side to side off and on the last few days. He used to do it a few mths ago - I thought it was to do with teething as he will shake his head when mouthing something to rub his gums. Now he does it when ther is nothing in his mouth, He does not appear to be in discomfort at all and is not rubbing at his ear or head - which I thought he would be if there was anything wrong there. He seems perfectly happy when he is doing it. I am planning to phone the doctors but has anyone got any ideas?