If the toddler’s tongue is black, the following conditions should be taken into account: first, the normal situation of dyed moss, if the toddler’s tongue is mainly black in the middle, and the toddler does not have any obvious discomfort, it should be considered whether the toddler is eating black colored food, such as mulberries, plums or other fruits with color, purple fruits, etc.; second, the pathological state of this state of affairs may also be accompanied by other symptoms on top of the blackness. For example, in addition to the black tongue moss is also thick, the young child has obvious discomfort, such as intestinal discomfort, stool is not clear or for many days, to consider whether the stool internal heat, the accumulation of internal causes. Thirdly, there are other diseases of the kidneys. If parents can not identify, it is recommended to go to the hospital for further consultation.