Jaundice within 24 hrs of age Hemolytic disorders: UB, rise rapidly, high level Rhesus hemolytic disease: jaundice, anemia, hydr roDs hepatosplenomegaly; antenatal identify, fetal therapy ABO incompatibility: less severe. more common, slight or without anemia, peak in the first 12--72hrs G6PD deficiency: epidemiology; some drugs, infection, nypoxIaJaundice within 24 hrs of age Hemolytic disorders: UB, rise rapidly, high level Rhesus hemolytic disease: jaundice, anemia, hydrops, hepatosplenomegaly; antenatal identify, fetal therapy. ABO incompatibility: less severe, more common, slight or without anemia, peak in the first 12—72hrs. G6PD deficiency: epidemiology; some drugs, infection, hypoxia