Diarrhea in a 2.5 year old baby is mainly caused by pediatric indigestion and pediatric enteritis, which requires a visit to the hospital. After clarifying the cause and under the guidance of a professional doctor, most affected children can be relieved by adjusting their diet, giving probiotics and anti-infection. Common causes and treatment 1, indigestion: parents to the baby’s diet with improper, eating too much indigestible food, such as meat, eggs, eating less vegetables, fruits, easily lead to 2.5-year-old baby diarrhea. Parents are advised to adjust the baby’s diet and pay attention to dietary hygiene at the same time. Mostly manifested as diarrhea, stools more often, stools containing a small amount of water and milk lumps, sour smell, reduced food intake of children, occasionally vomiting, the symptoms of the lighter ones can be relieved by hot compresses, gentle massage of the abdomen, adjusting the structure of the diet, if not relieved, follow medical advice to be probiotics, spleen granules to regulate gastrointestinal function, if necessary, can use montelukast to stop diarrhea; 2, intestinal inflammation: mostly caused by infection with viruses or bacteria, the main Clinical manifestations are frequent diarrhea, 3-10 times / day, stool is watery, may contain a small amount of mucus, may also have blood stool, accompanied by loss of appetite, occasional overflow or vomiting and other symptoms. It is necessary to consult a doctor in time, to give oral or intravenous rehydration, to correct the disorder of water, electrolytes, acid-base balance, if necessary, antibiotics, such as cefixime, etc. Attention 2.5 year old baby diarrhea, pay close attention to the child’s mental state and dehydration, give the child more warm water during treatment, and pay attention to the regular sterilization of milk and food utensils, give the child diligent hand washing.