My 22-month-old biracial grandson has had a heart transplant. He received a blood transfusion 3 weeks ago,and his hemoglobin is low again today, so he will receive another transfusion tomorrow. A bone marrow biopsy was done and supposedly ruled out black fan diamond disease. However,there must be some cause for the red blood cells not to be produced. He has had ongoing problems with reflux and vomiting, and is fed through a gtube. He is, of course, on anti-rejection meds, along with others.