The correct way to change infant formula should be to mix the old with the new, and to do it gradually. If you feel uncomfortable after adding, stop changing for 3-5 days and then continue to add.
At the beginning of the change, add 1/5 of the new milk powder and 4/5 of the old milk powder mix. After 3-5 days of adaptation, if the baby does not have diarrhea and other symptoms, then add 2/5 of the new milk powder, add to 3/5 of the old milk powder. 3-5 days later, if the baby does not have gastrointestinal discomfort, you can continue to add 3/5 of the new milk powder, gradual and orderly, until complete replacement.
When your baby is unsuccessful in switching milk powder, it is recommended to drink the old milk powder for a longer period of time, and then switch the milk powder when your baby is a bit older. If your baby has been drinking the same formula for a long time without any symptoms, it is not recommended to change the formula at will.
The baby has obvious diarrhea and eczema after drinking milk powder. It is recommended to change the milk powder in time, change the milk powder to mix the old and the new, step by step, always pay attention to the baby whether there is discomfort.