How many baby teeth?

At about six months of birth, teeth begin to erupt one after another. At two and a half years old, the child's teeth will completely grow out. There are 20 deciduous teeth in total. At the age of six or seven, teeth will begin to change. All deciduous teeth fall off and are replaced by permanent teeth. The earliest deciduous teeth are mandibular deciduous central incisors. The eruption of deciduous teeth has a certain order.