It is completely normal for a child to grow 8 teeth at the age of one and a half years, there is a certain time, position and order rule for children to grow teeth, generally speaking, the first milk teeth start to erupt around 6 months, the earliest milk teeth erupt is the teeth in the middle of the lower jaw, and it is symmetrical eruption, symmetrical eruption on the left and right side at the same time, after the teeth in the middle of the lower jaw erupt, often the incisors of the milk teeth in the middle of the upper jaw erupt again, so around one and a half years old It is normal for 8 baby teeth to erupt, 4 incisors on the bottom and 4 incisors on the top. Generally speaking, by the age of two and a half, 20 milk teeth will have erupted completely, and there are certain rules for the timing, location and order of milk teeth eruption. This situation is also relatively common.