How to turn diarrhea milk powder into normal milk powder

Baby eating diarrhea milk powder want to turn to normal milk powder, you can use 2/3 of the original milk powder to add 1/3 of the new milk powder, has continued for a week, the baby gradually adapt to the beginning of the second week, the original milk powder and new milk powder each accounted for 50%, and then adapt to a week, and so on, gradually reduce the amount of original milk powder.