My 2 year old boy has been complaining of he back of his head for a while now, we never really thought much of it as he is still himself and acting normal. After we bathed or showered him and we lay him on the bed to dress him, he holds the back of his head and cries terribly and keeps saying head hurts. But eventually he stops and allows us to dress him. After dressing him he will carry on playing as normal. This week the teacher at his crèche has informed me he keeps complaining of his head being sore, the whole day. I am worried, but there is no other complaints, he is healthy otherwise. Could this be serious?