Hemolytic disease of the newborn

A 32-year old woman, gravida 2, para 1, at 39 weeks’ gestation comes to the emergency department with contractions. She says that she did not have any prenatal care because she does not have health insurance. Upon delivery, the infant appears jaundiced and has marked hepatosplenomegaly. Serum hemoglobin is 11.6 g/dL and serum bilirubin is 8 mg/dL. Direct and indirect Coombs tests are both positive. The mother has never had a blood transfusion. Her previous child was born healthy with no complications. Which of the following is most consistent with the presentation of this disease?