There are various suspensions of iron. We use it everyday as prevention, because the diet cannot give the iron needed to a growing toddler, even if in formula there is iron added. To evaluate the iron stores better, you should measure ferritine in the blood and not iron itself. If your son has a deficiency he should take a supplement, but the dosage you should discusse it with your pediatrician. Other supplements that we take are vitamine B12, and vitamin D.Hope this helps.