Okay, now have further information about the baby: The baby has not been transfused before and as far as we know the mother had no transfuson during the pregnancy. Baby transferred from another hospital to us on day 5 and underwent aortic arch repair and VSD on day 8. The surgery was postponed 3 days for IVIG. One aliquot of incompatible blood was transfused prior to surgery, one whole unit during the surgery and one aliquot post surgery - all 2+ incompatible. - Baby is recovering fine from the surgeries, second one was to close the chest. - Both parents are Bpos. - Baby is not septic We also did a 16 cell panel screen, all 2+. Rh phenotype mother and baby both R2R2. Bilirubin on day 5 was 215, today it is 52.9. Baby also received plasma, platelets and cryo at the time of surgery. Probably enough blood and plasma for the equivalent of a full exchange. Any further ideas?