Alimentum/Nutramigen and transitioning to regular formula/milk

Hi, do any of you have experience with either your October baby or an older child and switching from a hypoallergenic formula to a regular formula or whole milk at a year old? I plan on asking our pediatrician at my LO’s 9 month appointment next month, but thought I’d do a little homework before hand. My son has been on similac alimentum since he was 1 month old. I’m not sure if I should just plan on keeping him on that until 1 year or try a “partially hydrolyzed” formula to see how he tolerates it. I have not included dairy in his diet in anyway yet. I know most babies grow out of milk sensitivity or dairy allergies, but it seems a little extreme to go from a hypoallergenic formula to straight whole milk.