1. Principles for Selection of Milk Powder for Diarrhea Diarrhea refers to an increase in the frequency of defecation, a decrease in the amount of stool, watery or mushy form, and is accompanied by uncomfortable symptoms such as abdominal bloating and abdominal pain. For infants and young children, because the intestinal immunity is not fully developed, they are easily affected by external factors such as bacteria and viruses, causing diarrhea. When a baby has diarrhea, he or she needs to adjust his diet in time and choose appropriate milk powder.