Hi. My daughter is 10 months old. I was told by her dr. that her iron was low and should give her enfamil iron drops. They have been very constipating even after eating fruit juice, prunes, and lots of vegetables. I bought liquid iron made with ferrochel that is supposed to be more gentle on the stomach. For 1 Tablespoon (15ml), contains 18 mg Iron (as Ferrochel amino acid chelate). It says for child 2 years and up 1/2 tablespoon. How do I convert the dosage for my daughter?