I had this question too and still haven't really figured anything out. My two toddlers did get a multivit prescription from their ped. but she added flouride to it and im not so sure about giving them flouride like that :/ So I havent been giving them anything and thinking they are getting all they need b/c they are such good eaters but I dont really know? I did give them a Vit D chewable the other day (Natures plus brand) but it made my 3 yo seem more hyper and she was acting out more than normal, a friend of mine has had the same experince with these vit too, not sure if it's the brand or the vit D itself? I'm going to try again with it and see if she acts differently again or if it was just coincidence.