When do you start to change formulas from a stage to another stage ? Example stage 1 to 2 , 2 to 3 ? Do you really wait till exact months or age to change to another stage ?

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Wee Qi

Mum of 2 michelin baby haha

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Home Baby when start change formulas from stage another stage example stage 1 2 2 3 really wait till exact months age change another stage