My baby is going to complete her sixth month within a week. After six month should I need to change her formula immediately from stage 1 to stage 2 ?? Or it should be gradually?? plz suggest

A. After completing the age of seven months if you change the formula would be easier for the child to digest because by the new child would be able to digest little heavier food and milk if you change it by completing the time gradually that is going to be the correct way for you to proceed with