It is normal for babies to have no teeth at 8 months. The eruption of baby’s milk teeth starts 6~10 months after birth, and those whose milk teeth have not erupted even after 13 months are called delayed eruption of milk teeth. Generally speaking, the eruption of lower incisors can be seen around 6 months after birth, but the time of eruption of milk teeth is affected by genetic, endocrine, food traits and other factors, with large individual differences. When teething, individual children may have low fever, increased salivation, sleep disturbance, irritability, etc. Parents can observe whether the child has these symptoms, but should pay attention to the high fever and more serious symptoms, should be immediately to the hospital to identify other pathological diseases. In addition, the child’s nutrition should be strengthened, the diet should be comprehensive, appropriate food chewing is conducive to the growth of teeth, if the teeth are still not 13 months, should actively to the hospital to clarify the cause.