I would say no. The doc was just making a generalization, as what all docs do. Now, w/o blood work, who is to say if your baby is deficient at all. I know some people naturally, have elevated iron levels, so if you give her more iron, you might be overdosing her. I know that's extreme, but my point is that docs aren't God; they don't know everything, that's why they're supposed to run tests in order to give accurate advice, not just "well it worked for Kid A, therefore it must work for Kid B". Ours suggested the same thing, but we never did. My (just turned 1 yesterday) son was strictly breastfed, has a dairy and soy allergy, is in the 75% of weight and height and, incidentally, his front 8 teeth came in perfect (he's cutting molars right now). Remember, breastfed babies literally suck nutrients out of you, so if you're supplementing yourself, like I was on prenatals, I think that's good enough. Also, if you eat a balanced diet, your baby will reap the benefits too. Good luck and great job on breastfeeding!