Just about every child has bit but whether or not they should be classified as a biter is another thing. There have been studies that were done that show about half of children attending daycares have been bitten three times per year. So biters are common.
Biting happens in many stages. The first stage is when the teeth are erupting from the gums. This is when your toddler will bite to make their gums feel better. This kind of biting will be soothed from biting a rattle or a teething ring. If your baby tries to bite you while breast feeding quickly remove the infant and set them down in a safe place. When an infant gets a negative response from their mother they will soon stop biting.
About the time that your toddler has their first birthday is when they have their second stage of biting. They usualy bite to show some excitement. At this time when your toddler tries to bit you should respond firmly every time and it should stop almost immediately.
At the age of two year your toddler will probably start to bite again. Your toddler bites at this time to show that they want to be independent. When your toddler bites to prove that they are in control then you need to give the child a time out and explain that it hurts. It is time to teach your child the commutation skills that they are probley lacking. After your toddler has the skills that are needed to commutate the biting should stop.
Be sure to watch your toddler closely if they are going through a biting phase. The best thing to do at this stage is to acknowledge the good behaviour. Another good tip is to offer something for your toddler to chew on. If you have caught your toddler biting the respond with a firm voice and place your toddler on a time out.