If your baby has diarrhea when you change formula, see if the symptoms are severe. If the diarrhea is more pronounced, you need to put the new formula on hold and switch back to the formula that was previously used smoothly. After observing the baby’s stool condition for about two weeks, you can add the new formula on a trial basis and in small amounts. At the same time, there should be a transition between the new formula and the original formula, i.e. there is a process of milk transfer. If the baby’s diarrhea is not very serious when switching to the new formula, and the overall situation does not have any effect on the baby, such as no obvious abdominal pain, bloating, crying, etc., mild diarrhea can be temporarily observed; you can also appropriately reduce the amount of the new formula slightly and observe it. Because the baby may need a process of adaptation to the new formula. When you can fully adapt to the new formula, you can feed your baby the new formula in the normal amount and in the normal way of preparation.