My son is now 20 months old. He is very adamant about what he wants and what he wants to do. If something doesn't go as per his wish, he starts throwing tantrums. The worst part is, he starts biting his mother to express his anger or frustration. If we try to scold him or if he feels guilty for anything, he starts hitting himself. We don't know how to change this behaviour of hitting himself in guilt or biting to express his anger or frustration.