A male neonate born to a 24-year-old primigravida had jaundice at 8 hours f life The neonates red blood cell time was A+, while the mothers RBC type was 0+. Laboratory studies revealed elevated titer of mother's anti-A antibody, normal erythrocyte glucose-6-phosphate and negative sickle cell test. The infant’s hemoglobin was 106 g/L. Which of the following is the most likely cause of infant’s jaundice?