Two and a half year old baby diarrhea, if it is caused by bacterial infection, need oral antibacterial drugs; for intestinal flora disorders caused by diarrhea, need oral probiotics to regulate the intestinal tract. If it is indigestion caused by diarrhea, can be taken orally and oral solution to help digestion, diarrhea serious need oral antidiarrheal agent. 1. Gastrointestinal infections: If the infection is caused by bacteria, you can take cefixime and other oral antibacterial; combined with fungal infections, you can take itraconazole orally, for viral infections, can not be special treatment; diarrhea, it is recommended to take montelukast to stop diarrhea. 2. Intestinal dysbiosis: when intestinal dysbiosis causes diarrhea, oral probiotics such as Lactobacillus acidophilus and Bifidobacterium bifidum should be taken to regulate the intestinal tract so as to restore the bacterial flora. 3. Intestinal indigestion: poor digestion, flatulence, food accumulation and other symptoms can also cause diarrhea. Can be taken orally, such as Baohe oral liquid, pepsin, etc. to help gastrointestinal digestion, such as diarrhea is serious, and then combined with montelukast to stop diarrhea. About two and a half year old baby diarrhea, need to first clarify the cause and then reasonable use of drugs, not unauthorized use of drugs, so as not to cause adverse reactions. The above drugs should be used in accordance with medical advice.