There are several possibilities to consider for infants with total diarrhea: first, it is more common to consider whether the infant has food allergies, commonly milk protein allergies and egg allergies, and breastfed babies related to the mother’s diet. The second is to pay attention to whether the infant has a disorder of intestinal flora and an imbalance in the intestinal micro-ecosystem. Because the intestinal micro-ecosystem of infants is not well established, it is easily affected by external environmental factors, resulting in loss of balance and easily leading to recurrent diarrhea. The third one is to pay attention to the presence of lactose intolerance, because the lactose content in both breast milk and infant formula is very high, and lactose intolerance is prone to frequent diarrhea. The fourth, pay attention to whether the infant has a weak spleen and stomach, poor resistance, or a chronic bacterial infectious enteritis.