A 3-year-old baby with diarrhea can take montelukast, bifidobacterium, and mometas, along with oral rehydration salts. Montelukast is an adsorbent, the drug will not be absorbed by the intestine after entering the digestive system. It also adheres to the intestinal wall and adsorbs bacteria and viruses in the digestive system, while improving the defense function of the intestinal mucosa, which can effectively reduce the symptoms of diarrhea and does not affect the physical development of children. Bifidobacterium is a probiotic in the intestinal tract, which can increase intestinal immunity and regulate the imbalance of intestinal flora, and has a two-way regulating effect on diarrhea and constipation. Mamma Love not only contains various vitamins and calcium, but also contains live bacteria needed by the intestines, which can improve the function of the baby’s intestinal system and help the baby digest and absorb the nutrients in food better. The baby will lose a lot of water during diarrhea, so parents can let the baby take appropriate oral rehydration salts to replenish the body’s fluid to prevent dehydration.