Diarrhea is medically known as diarrhea. The baby suddenly appeared diarrhea symptoms, may be physiological diarrhea, may also be pathological diarrhea, such as abdominal cold, intestinal infections, etc., mainly through the general treatment, medication and so on. 1. physiological diarrhea: due to the baby’s digestive system development is not yet perfect, can be due to cold, or allergic to milk, and so on, and cause physiological diarrhea. If the baby’s appetite, mental state are normal, and there are no other symptoms, generally do not need special treatment, you can adjust the feeding mode, reasonable feeding, pay attention to increase the clothing, while giving the abdomen warm. 2. Pathological diarrhea: (1) dyspepsia: diarrhea can be caused by improper diet, if the number of stools increases, and the baby’s mental state is relatively good, and there is no mucus, pus or blood in the stools, it can be observed first. If necessary, can be taken orally, such as compound pepsin to help digestion, probiotics such as bifidobacteria preparation to regulate intestinal flora, to promote relief. (2) Intestinal infections: If the baby is infected by bacteria, viruses, fungi and other pathogens, sudden diarrhea can also occur, and in severe cases, it can also cause dehydration. Antidiarrheal agents such as montelukast, bifidobacterium preparations, etc. can be used to regulate intestinal flora, and oral rehydration salts can be given, and intravenous rehydration is required in severe cases. If the bacterial infection, according to the drug allergy oral antibacterial drugs such as cefixime; if the viral infection, self-limiting, without special treatment. Parents should take their babies to the hospital for consultation and treatment if their babies have sudden onset of diarrhea. The above drugs should be used according to the doctor’s prescription.