How do I stop my son from biting and scratching? He is 23 months old and has been biting every day (10 times a day or more) for the last month and a half. I (Mom) am usually the one being bit the most along with his baby brother who is 8 months. 50% of the time it's when he is overwhelmed with love/happiness and bites my arm, neck, while hugging me or is laughing with the baby and then bends down and bites him. The other 50% of the time it's out of frustration when he is told NO, when he can't communicate or when I am paying attention to Peter. Consistent time outs are not working. He doesn't seem to understand that biting is painful. Other than this he is a sweet sweet boy. Thank you for your help.