Newborns with teeth at 20 days of age are usually not normal teeth, but may be “horse teeth” or premature teeth, which is not normal. Infants are generally 4 to 10 months after birth, milk teeth began to erupt, 13 months has not yet erupted is known as delayed eruption of milk teeth, most of them before the age of 3 years. And newborns are also common several special physiological state, such as “horse teeth”, premature teeth. 1. “Horse teeth”: in the mouth of the palate midline and gum area, there are yellowish-white, rice-sized particles, commonly known as “horse teeth”, a few weeks after the natural recession, parents do not pick, to avoid infection. 2. Premature teeth: also known as neonatal teeth, a few newborn babies appear in the lower incisor or other parts of the baby, usually do not need to be extracted; however, if you find that the premature teeth loose, should be promptly removed to the regular hospital, so as not to cause choking, choking, and so on. Therefore, it is recommended to go to the regular hospital to check the cause of newborn baby’s 20 days of teething.