Share 'Strange behaviour sometimes when eating'

Hi All,          Shea is 20 months old now and I have noticed some odd behaviour he presents occasionally whilst eating. He will begin munching and I will sit in the lounge, then all of a sudden he will come into the room and try to get as close to me as he can whilst arching his back and hunching a bit almost like he has pain in his tummy but he is not making any sounds of distress, I will rub h…