Baby has taken to hitting himself in the face with his little fist when I say 'no', or 'don't do that'. He also has a habit of banging his head on objects/the floor when he gets cross/frustrated. My HV told me to ignore the headbanging behaviour when I mentioned it a couple of months ago, but it's all quite upsetting. I say 'no' etc quite gently. Anyone any experiences like this?