The first thing to look for in a 1-year-old 2-month-old baby with diarrhea is how long the diarrhea has been going on and how long the illness is. If it is more than 2 weeks, you should go to the hospital to check the stool routine to identify whether the diarrhea is caused by gastrointestinal dysfunction or diarrhea caused by intestinal inflammation. If it is caused by gastrointestinal dysfunction, you can take oral pepcid, which is a probiotic or something like that, along with montelukast. If it is caused by intestinal inflammation, you should choose antibiotics for anti-infection treatment. 1 year and 2 months old baby choose the type of antibiotics, usually cephalosporin, if cephalosporin is not allergic, you can take it orally for 3-5 days, and then go to review the stool routine, after normal, you can stop the antibiotics, and then use probiotics or protect the gastrointestinal mucosa montelukast treatment.