i gave my childrens enfamil. and they do have guidlines on the stages... but i intro the stage 4 3 mnths prior before they turn 3. bcos i found out from my 1st child that it taste a lil bit diff... therefore i let them try earlier to get use to it. so far all went well.
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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...
no rush to start. you can start around feb it is still fine ^^
what brand are you using?