A 3-day-old term Indian neonate presents with jaundice. Serum bilirubin is 18 mg/dL with a direct fraction of 0.8 mg/dL. The mother is O Rh-positive and the baby is B Rh-negative. Which single clinical feature best distinguishes hemolytic jaundice due to ABO incompatibility from that due to Rh incompatibility?

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