There is no quick fix for diarrhea in a one year old baby. Diarrhea in one year old babies is often seen in indigestion, enteritis, lactose intolerance and other conditions, which can be resolved through the use of medication, life interventions and so on. 1. indigestion: eating too much or abdominal cold stimulation may lead to indigestion, causing one-year-old baby diarrhea, it is recommended that the use of probiotic drugs such as lactobacillus acidophilus for treatment, usually also pay attention to abdominal warmth, reasonable eating, etc., can help alleviate the symptoms. 2. enteritis: due to infection caused by enteritis will also make the one year old baby diarrhea, can use montelukast and other antidiarrheal drugs, for bacterial infections caused by diarrhea also need to cooperate with the use of antimicrobial drugs such as cephalexin, viral infections caused by diarrhea, has a self-limiting. Viral infections cause diarrhea, which is self-limiting and can be treated without special treatment. 3. Lactose intolerance: If the child has lactose intolerance, it can also lead to diarrhea symptoms, at this time you need to add lactase treatment, or switch to lactose-free milk powder. Can relieve the symptoms. If the symptoms of diarrhea in one-year-old babies are serious, or if the symptoms persist and do not improve, they should go to the hospital in time for treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.