You attended the delivery of monochorionic twins who were bo…

You attended the delivery of monochorionic twins who were born at 33 weeks gestation.  One of the twins appeared much paler than then other twin in the delivery and so you ordered CBCs on both of them. Twin A had a hemoglobin level of 19.5 and twin B had a hemoglobin level of 10.2 with a retic count of 5%. Your diagnosis is: