My son(Twins) is one month old he born pre term baby 35th week borned they refer Similac NeoSure milk powder now 40 week complete which milk powder I use???

A. Continue with the mail that has been suggested by the doctor for another month and then you can shift to the regular stage one of the mail that your doctor recommends because since your kids are on hundred percent formula feeding you should proceed with stage one after two months of the delivery that is there