Hi MM - I EBF, so it may be different, but my ped recommends vit D drops from birth and then a poly-vit containing iron starting at 4 mo (this is different from 3 yrs ago with DD, when iron-rich solids were encouraged starting at 6 mo, so I haven't followed it
). If I were you, though, I'd check with your dr first as I *think* formula is fortified with most essentials. You wouldn't want to give too much of a good thing.