ABO and Hyperbilirubinemia: In the current study, the cause of indirect hyperbilirubinemia was ABO incompatibility in 335 (42.5%) cases, Rh incompatibility in 64 (8.1%) cases, combined ABO and Rh incompatibility in 27 (3.4%) cases, sepsis in 55 (7%) cases and cephalhematoma in 4 (0.5%) cases.