Two and a half year old children do not vomit, just diarrhea, if indigestion caused by the need to adjust the diet, if infectious diarrhea caused by the need for anti-sensory and so on. 1. indigestion: if you eat not easy to digest food or eat too much, more than the child’s gastrointestinal tract digestion and absorption function, it is easy to cause indigestion, diarrhea symptoms can occur. This situation needs to adjust the diet, should be light, such as porridge, vegetables, fruits, etc., avoid eating greasy, spicy food. You can take montelukast to stop diarrhea and lactobacillus tablets to promote digestion. 2. Infectious diarrhea: mostly caused by bacterial or viral infections of the intestinal tract, viral diarrhea is easy to cause dehydration, need to actively give oral rehydration salts to correct dehydration. Bacterial diarrhea can be treated with antibiotics such as cefixime, infectious diarrhea can also be combined with probiotics such as bifidobacterium trichotomum to regulate the intestinal tract, montelukast to stop diarrhea and other comprehensive treatment. Two and a half year old children with diarrhea, should promptly consult a doctor, give corresponding treatment. The above medication should be used under the guidance of a doctor, avoid self-medication to avoid adverse effects.