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After that first tooth breaks through, more and more teeth begin to appear. Most kids have their first set of teeth by the time they are 3 years old. These are called the primary teeth, baby teeth, or milk teeth and there are 20 in all. When a child gets to age 5 or 6, these teeth start falling out, one by one. A primary tooth falls out because it is being pushed out of the way by the permanent tooth that is behind it.
Age Range. Most babies get their first tooth between the ages of 4 and 7 months, according to the Healthy Children website. Usually, the bottom two front teeth emerge first, followed by the top two front teeth. The molars and the teeth on either side of the front teeth will fill in during the next several months.