It can be hard to determine what teeth are baby teeth and which ones are permanent. Your baby's first tooth makes its grand debut around 6 months of age, and by two to three years old, all 20 baby teeth should have erupted in their mouth. Six years old is when you can expect your children to lose their first baby teeth and have permanent teeth peek through. Keep the tooth fairy on standby; this process of permanent teeth replacing baby teeth will continue until your child is 12 or 13.
As your child gets older, it can be hard to tell the difference between baby teeth and permanent teeth. Having teeth of both types is called a mixed dentition. The American Dental Association's tooth eruption chart is a good guide that helps parents know approximately when their child's baby teeth will appear, when they'll shed them and when their adult teeth will come in. The chart helps you distinguish which teeth belong to the first or second set.