Changing formula milk

If I need to change the brand of current formula milk that my little one drinking. Can I just change immediately or I need to mix old formula with the new formula?#firstmom #pleasehelp #advicepls

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My confinement nanny suggested to alternate between old brand and new brand first until the old brand finishes then completely change to new brand. Can start when there is about 1/3 tin of old brand milk left. I haven’t had the chance to try yet because my baby has no problems with my current FM.