My son has begun to bite me and my husband.
If your son has suddenly started to bite either himself or other people, it is important to first rule out any medical or dental problems that could be causing pain. Having then ruled these possibilities out, you need to examine the possible triggers for the biting, using a diary. For some children, biting provides sensory stimulation, either by relieving tension in the jaw, or by providing stimulation in the mouth. If this is the case, you need to provide alternatives to bite on. It could be dried fruit, or products such as thera tubing or chewy tubes.
It may also be that your son gets positive reinforcement from the reaction he gets from people when he bites. It is our natural instinct to react strongly. However, it may be the very reaction that your son wishes. If this is the case, try to react as neutrally and calmly to the biting as possible: a firm 'no biting' reinforced with a no biting symbol and calm facial expression.
Biting can also be used to express a child's frustration at not being understood. If this is beginning to happen, speak to professionals about providing alternative forms of communication.