Children’s bad breath from colds is mainly due to the fact that the various sources of infection that cause colds, such as viruses or bacteria, mycoplasma can cause the body’s gastrointestinal dysfunction, leading to indigestion or gastrointestinal dynamics, which leads to the production of bad odors. Therefore, active treatment and regulation of gastrointestinal function is needed. It is recommended that while children’s cold medicines are given to treat the primary disease to relieve cold symptoms, medicines to regulate gastrointestinal function, such as probiotics, should be given in the case of bad breath. Commonly used are Saccharomyces boulardii, Bifidobacterium bifidum and so on, and the Chinese patent medicines are Wake up the spleen and nourish the child granules or Shenqu elimination of food oral liquid. In terms of diet, we should give a light diet, eat more liquid food and easy-to-digest food, and do not eat greasy and high starch food that is not easy to digest.