When changing milk powder for babies, you can choose to feed two kinds of milk powder together or reduce the feeding frequency of the old milk powder. 1. two kinds of milk powder with feeding: you can new milk powder and old milk powder with feeding, and then cycle gradually reduce the amount of old milk powder, and new milk powder can be increased appropriately, until the complete transfer of milk. 2. Reduce the number of times the old milk powder is fed: you can first reduce the number of times the old milk powder is fed, for example, 4 to 5 times a day, and then can be reduced to 2 times a day, 2 times the old milk powder is fed, 2 times the new milk powder is fed, and then gradually reduce the number of times a day, 1 time the old milk powder is fed, 3 times the new milk powder is fed, and then gradually transition to the new milk powder. It is recommended to adjust the speed of changing milk powder for infants under the guidance of professional doctors, and if there is any abnormality, it is recommended to consult a doctor in time.