The cause of diarrhea in one and a half year old babies may be pathogenic infections or improper diet caused by indigestion, etc. Different causes of treatment methods are different, according to the cause of the targeted treatment, such as the application of penicillin, montelukast, probiotics, etc., as well as dietary management. 1. Pathogenic infections: If a one-and-a-half-year-old baby’s diarrhea is caused by a pathogenic infection, such as a viral or bacterial infection, the diarrhea may cause the baby to become dehydrated, so you need to give the baby more hot water or rehydration therapy. If necessary, the application of antibiotics such as penicillin, viral infections generally supportive treatment. 2. Dyspepsia caused by improper diet: If a one-and-a-half year old baby has diarrhea due to dyspepsia caused by improper diet, you need to let the child eat a light diet, eat easy to digest food such as porridge, noodles, etc. And you can use montelukast and other antibiotics to treat diarrhea. And you can use montelukast, probiotics, etc., to control the symptoms of diarrhea, protect the child’s gastrointestinal tract, improve digestion, etc., need to pay attention to replenishment of water to avoid dehydration. One and a half year old baby diarrhea, need to take the child to the hospital in time for a detailed examination, a clear diagnosis of targeted treatment, the above drugs need to be used in accordance with medical advice. During the period of diarrhea need to let the child light diet, drink more hot water, pay attention to the child’s stomach warm, let the child appropriate exercise, improve digestive function, enhance the child’s resistance.