Good day! Could you please tell me how to correctly switch from one mi…

Good day! Could you please tell me how to correctly switch from one mixture to another? We started incorrectly. On the first day we gave 30 ml once in the morning. (The rest of the amount was given the old mixture). On the second day we gave 60 ml once. On the third day we gave 90 ml once in the morning and in the evening green stools appeared. Now today we gave again 30 ml of the new one, 60 ml of the old one. We switched from nan optipro to nan triple comfort due to constipation.