Biting is a common behavior in most toddlers and increases when a child is tired or frustrated. You should never bite back or overreact when it happens. Experts and research all show that it is wrong to bite back so don't take anyones advice if they recommend to. Toddlers like the reaction. You have to teach your child that it is unacceptable behavior. You could give them these steps:
Some steps to take when your child bites include:
Immediately look him in the eye and give him a loud and firm 'NO.' You may also move him to another area for a time out. Let him know that it is never all right to bite another person because it hurts.
Supervise your child closely when he is with other children, so that you can distract him or interrupt any behavior that may lead to biting.
It is important to not overreact and never bite your child back. Biting him back or using physical punishment will just reinforce that it is okay to hurt others.
Give him lots of praise when he controls himself and doesn't bite.
Biting back will only fuel his anger and cause aggression. Ignore all these dumb people that recommend to bite back. They obviously aren't educated on child development.
I studied this in school:
Children's hands are tools for exploring, an extension of the child's natural curiosity. Biting them back sends a powerful negative message. Sensitive parents that were interviewed all agree that the hands should be off-limits for physical punishment. Research supports this idea. Psychologists studied a group of sixteen fourteen-month-olds playing with their mothers. When one group of toddlers tried to bite another child. They received a bite on the hand; the other group of toddlers did not receive this form of physical punishment. In follow-up studies of these children seven months later, the punished babies were found to be less skilled at exploring their environment. Better to separate the child from the object or supervise his exploration and leave little hands unhurt.