Diarrhea in children usually occurs in infants and toddlers less than 2 years old and is prone to occur in summer and autumn. Once a diarrhea condition occurs in children, it should be treated promptly to avoid electrolyte disorders that can endanger the baby’s life and health. So, what are the causes of diarrhea in children? 1, because 1-2 years old babies grow and develop particularly rapidly, so the body needs more nutrition and heat energy. However, the digestive organs are not fully developed and secrete less digestive enzymes. Therefore, the digestive ability is weaker and diarrhea easily occurs. 2, because of the poor regulation of the gastrointestinal system by the nervous system, a slight change in diet, such as not adapting to the added complementary foods, adding too many types for a short period of time, or feeding too much at once, sudden weaning or improper diet, such as eating protein foods that are not easy to digest; low temperature and cold body accelerates intestinal peristalsis, the day is too hot, the secretion of digestive juices decreases and the temperature difference in autumn, the small tummy is easy to get cold, etc., can cause diarrhea. 3, because the whole body and gastrointestinal tract immunity is low, so as long as the food or food utensils are slightly contaminated, it can cause diarrhea; baby because of low resistance to respiratory infections, in the case of colds, pneumonia, otitis media, can also often cause diarrhea.