Provide the toddler with nurturing support, to help him understand that he and his possessions are safe. Imitation is one of the many ways young children learn. So it is not unusual for a child to observe a friend bite, then try it out for herself. Offer the child many examples of loving, kind behavior. Never bite a child to demonstrate how it feels to be bitten.
Children love attention, especially from adults.
When parents give lots of attention for negative behavior, such as biting, children learn that biting is a good way to get attention. Provide lots of positive attention for young children each day. It is also important to minimize the negative attention to behaviors such as biting. Toddlers have a strong need for independence and control. Very often the response children get from biting helps to satisfy this need.