Teething does not cause diarrhea in babies, and its occurrence is usually associated with acute gastroenteritis, which should be handled by parents in a timely manner. Teeth growth and newborn diarrhea is not directly related, may be part of the baby due to the discomfort of emerging teeth and like to bite things, when it accidentally eat unclean things may appear related to the situation. Clinically usually considered to cause newborns with diarrhea symptoms of diseases such as acute gastroenteritis, which is mainly related to the baby there is unclean eating, gastrointestinal tract by bacterial invasion and stimulation, clinical manifestations of diarrhea, vomiting, crying and so on. This situation should be as early as possible to the hospital for consultation and treatment.