I have been trying to solve this mystery about my twin brother's death. We were fraternal twins, not identical twins. Yet he died about two hours after birth from severe bilateral pulmonary hemorrhage. The death certification also said he had mild erythroblastosis. We both weighed about 6 pounds, 6 ounces, give or take a few ounces. I have heard of this combination in identical twins due to problems via the shared placenta, but fraternal twins, of course, are in separate placentas. What are the possible causes of my brother's condition that killed him?