Hi. My son is 10 years of age. He has a severe congenital heart defect called hypoplastic left heart syndrome. He has had three open heart surgeries and is doing well. Last week he had his annual cardiac exam at a the number one hospital for pediatric cardiology care. His doctor discussed starting him on a multivitamin. Kids with his condition are often smaller and grow more slowly than their heart healthy peers (as is the case with my son). I had been avoiding vitamins and supplements because my son takes coumadin and I don t want to alter the INR level. I know that is related to vitamin K- but not sure if there is a multivitamin that doesn t contain vitamin k.