The baby’s teeth begin to erupt around 6 months of age and finish erupting at about 20 months of age. A total of 20 milk teeth will erupt, which is the clinically determined number and the correct number of milk teeth for all children is 20. The pattern of eruption is that the middle teeth erupt first, and then the teeth on the sides erupt in order of progression. Of course, there may be a reversal of the order in the middle, which is normal. There are also differences in the timing of tooth eruption, some children may erupt early and some late, but most of the 20 baby teeth erupt between the ages of 2 and 3, and the replacement of baby teeth and permanent teeth takes place between the ages of 6 and 13.