Two year old babies usually erupt 16 milk teeth, the right side of the upper, left side of the upper, right side of the lower, left side of the lower, each side of the four milk teeth eruption, may be the second milk molar has not yet erupted. The second molar is usually erupted around two and a half years old. The eruption of baby’s milk teeth has a basic law of time and position, and there is a relatively large individual difference in time, so a two year old baby will usually have 16 teeth erupted, and there may be individual differences. The law of symmetry in tooth eruption is that the left and right teeth of the same name tend to erupt at the same time. In addition, the first baby tooth usually erupts around 6-7 months of age, often the middle one below it, and the others follow. The overall order of eruption, counting from the baby incisors, is first, second, third, fourth, fifth, and so on, and the order of eruption is often in the order of one, two, four, three, five.