When a one-year-old baby has diarrhea and dilute water, it is easy to dehydrate leading to circulatory failure, which is more serious inside the diarrheal disease. It is important to observe the number and amount of your baby’s stools and to understand the cause of your baby’s diluted water in time for symptomatic treatment. In mild diarrhea, the baby has diluted water about 3 to 10 times a day, with occasional nausea and vomiting. Most of these cases are due to non-bacterial infectious diarrhea caused by improper feeding, indigestion or catching a cold. Treatment: First, we should add oral rehydration salts to water to replenish the baby’s lost fluid in a timely manner, and feeding should be regular and quantitative; pay attention to climate change, increase and decrease clothes in a timely manner, and pay attention to the warmth of the abdomen; adjust the baby’s diet appropriately, and reduce the intake of starchy or sugary foods. In severe diarrhea, the baby has frequent diluted water, ten to dozens of times a day, often accompanied by vomiting, mostly with irregular low fever, or high fever in severe cases. At this time should be quickly to the hospital, under the guidance of the doctor medication, never self-medication. Treatment: First, we should add oral rehydration salts to water to replenish the baby’s lost fluid in time, and test the baby’s stool to find out the cause of diarrhea so that we can prescribe the right medicine. Control infection, correct water and electrolyte disorders, and provide good care. Consider giving your baby a mucosal protector such as Similac or Mammazine, which can cover the intestinal mucosa, adsorb pathogens and toxins, enhance the barrier function of the intestinal mucosa, and stop the attack of pathogenic microorganisms.