while it is probably fine for your baby i would take it back and get the formula specifically for newborns. the manufacturers often use easier to digest proteins and different levels of dha and other nutrients to more closely match the stage of development. many of these companies invest in research to determine which ingredients and nutrients to add to their formulas. breast milk also changes with time so formula should be no different. congrats on your new baby!
i made a mistake and i bought 9 to 24 months formula for my newborn. can he drink it?