If your baby suddenly develops diarrhea, it might be due to dyspepsia and heat. It is recommended to take oral pepsin preparations to aid digestion, oral probiotics to regulate the gastrointestinal tract, and oral attapulgite powder to stop diarrhea. To replenish fluids, you can take oral rehydration salts dissolved in water in small amounts, multiple times. During this season, acute gastroenteritis in babies is often cold syndrome, and a belly button patch can be used. Wishing for a quick recovery!