for how long could I use Similac total comfort for my kid?...on tin it is written upto 6 months but doctor suggest to give same milk for a year

A. Different stages are meant to be given for different age groups of so for first months to 7 months complete I would say you should stick to stage one and stage two only should be given after completing the time of seven months so that is how you can continue giving this milk up till the age of one year as per your recommendation