When infants are born, almost all of their primary teeth already have formed. These teeth are still hidden in the gums. they usually begin to erupt or cut through the gums at about six months of age. Some babies get teeth earlier, and some get them later. That's o.k. Usually, the two front bottom teeth come in first. Next are the four front top teeth and two more bottom teeth. From here, teeth slowly begin to fill the mouth. Teeth usually come in two at a time, one on either side of the jaw. Your child should have all 20 primary teeth by the time they turn 3 years old.
Baby teeth usually have spaces between them. These spaces help make sure there is enough room for the permanent teeth. In fact, lack of space between the baby teeth can sometimes mean that adult teeth will be "crowded"
or not enough room to come in.
Dr. James L. Johnson