(only read first post) I was not given that advice and frankly, I wouldn't take the advice. I started Violet on solids at just short of 6 months. She was showing interest in food and I was excited to start feeding her, so I didn't wait until 6 months exactly. I made a point of feeding her foods with good nutrition and not just fruits and vegetables which they can't really digest. I started with things like meat and eggs. Believe it or not, the right meats are very easy for babies to eat and are much more digestible than fruits and veggies which they have a terrible time digesting. Her first food was salmon which is a perfect baby food. She also had some fruits like avocado and banana which despite my previous statement, are also excellent baby foods. She also ate egg and cheese. I did do things like strawberries and kiwi, but even she at the time, preferred meat, cheese, and eggs. Her iron levels were tested at 9 months and if she had been deficient then, we would have been given diet advice and maybe a supplement.
OK, now that' I've typed all that, I do remember iron drops being recommended by WIC... but now I can't remember how old Violet was! I also can't remember whether or not the pediatrician recommended them... We never did give them to her though.