There is no quick fix for one and a half year old babies with diarrhea, one and a half year old babies with diarrhea is often caused by indigestion, viral infections, bacterial infections and other conditions, need to be selected according to the condition of the general treatment, medication for treatment. 1. indigestion: indigestion caused by one and a half year old baby diarrhea, it is recommended to use bifidobacteria and other probiotics to regulate intestinal flora. You can also promote intestinal peristalsis through abdominal massage to help digestion. In addition, you can also drink more water and eat more fiber-containing vegetables and fruits such as bananas and celery to help relieve the symptoms. 2. Viral infections: one and a half year old babies may also have diarrhea after a viral infection, viral infections are self-limiting, can not be special treatment, diarrhea can be used to stop diarrhea when severe montelukast, but also oral rehydration salts to prevent dehydration. 3. Bacterial infection: bacterial infection caused by one and a half year old baby diarrhea, according to the drug allergy can use cefixime and other antibacterial drugs for treatment. You can also take probiotics such as bifidobacteria orally to regulate intestinal flora and help promote recovery. If your one and a half year old baby has severe diarrhea, or if the symptoms persist and do not improve, you should go to the hospital for treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.