It can be very upsetting and you do feel helpless at times. Our youngest is a boy and only 13 months old and he scratches, bites, throws things across the living room and will point blank refuse to sit in a highchair screaming and stretching his torso to get out. Its a shock to my system as our girls never displayed such behavior and every day outings are becoming a big chore. As a treat I took all the children out to lunch today and to get a few treats from Soup Dragon. He threw his food on the floor, wacked my arm and screeched for what seemed like eternity and then howled in his stroller all the way down Lordship Lane. I felt sorry for the girls as they were trying to pretend that the noise and obvious stress I was under was not disturbing them in anyway. So your not alone.