Causes and clinical Features Unconjugated hyperbilirubinemia 1. Fetomaternal blood group incompatibility 2. Infection 3. Breast jaundice(母乳性黄疸) 4. De layed meconium passage 5. Others: asphyxia, hemorrhage, polycythemia(红细胞增多症)Causes and Clinical Features Unconjugated hyperbilirubinemia 1. Fetomaternal blood group incompatibility 2. Infection 3. Breast jaundice(母乳性黄疸) 4. Delayed meconium passage 5. Others: asphyxia, hemorrhage, polycythemia (红细胞增多症)