How many licks would it take? Can the iron in bars even be processed by the body? Can you do this for other minerals?
How about we imagine the scenario that happened?
A doctor suggests a solution, via direct supplements.
The parents ask if they can try dietary first, because they are correctly nervous about direct supplementation for an infant even if it is needed, and want to go for a safer option first if possible.
The doctor sees that the situation could also be solved via dietary supplementation, and is not so severe as to require direct supplements only, and says yes. Lets start with dietary.
The baby gets better, because dietary solved the problem.
Decades later, an internet troll tries to pretend that asking for alternatives and discussing your options with your doctor is akin to anti vax mentality, while drinking heartily from a solid lead mug.
Here, real medicine was practiced, and then someone who doesnt actually know what they are talking about tried to shame a parent for doing the completely normal thing of discussing options with their doctor