There are 20 milk teeth, ten at the top and ten at the bottom. Teeth usually erupt in pairs from the front of the mouth to the back, the bottom pair arriving a couple of months before the corresponding top pair. Although the age at which babies begin to teethe and the rate at which it proceeds differ greatly, the chart below indicates the order in which teeth usually appear.
If your baby bites when breast feeding, you could discourage this by immediately taking away the breast. This will teach your baby that biting interrupts feeding!