1. The formation process of deciduous teeth Human deciduous teeth begin to form during the fetal period, and generally begin to grow around 6 months before birth. The formation process of deciduous teeth includes three stages: tooth germ formation, healing and calcification. During the tooth germ formation stage, the shape and number of deciduous teeth will vary due to genetic factors and maternal nutrition. 2. The growth pattern of baby’s deciduous teeth: Babies are born without teeth, but about 6 months after birth, the first deciduous tooth will grow. Then, at 12-18 months, the second baby tooth will come in, followed by the other baby teeth. Under normal circumstances, at the age of 2 and a half