Stage 4 milk

my dau is turning 3 yrs old in feb 2019. At this moment she is drinking stage 3 milk. May i know when can i start giving her Stage 4?? Before she turns 3 yrs old or it has to be exactly 3 years old. If it is before, whats the best time to give.

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Typically have to be on the day she turns 3 itself but you have to slowly sub out the previous milk.. eg if taking milk twice a day, change one feed to new milk, next day change 2 to new milk, etc...