If a baby has abnormal stool after drinking formula milk, it may be due to dyspepsia. It is recommended to adopt proper feeding methods and observe the baby. If the situation does not improve, the baby should be taken to a pediatric clinic for a check-up. As of now, there is no need to change the formula milk if fed according to the instructions. It is suggested to start with breastfeeding and then add formula milk when the breast milk is sufficient. The amount of formula milk should be gradually increased, starting with a small spoon. At the same time, the amount of formula milk should be adjusted according to the amount of breast milk. As the frequency of breastfeeding increases, so does the breast milk volume, so the amount of formula milk should gradually decrease until the baby can be fully breastfed. If the baby’s dyspepsia is severe, consider taking probiotics for regulation.