Pediatric Jaundice Treatment Questions

The child is 14 days old, the jaundice has not receded for a long time. After 7 days of birth, the treatment reached the exchange transfusion critical value, and the bilirubin level decreased after blue light therapy, but the decrease was very slow. After stopping the blue light, the bilirubin level rose again. Both the child and the mother have type O blood, and blood compatibility has been ruled out. The child is now 14 days old and is being treated in isolation at the hospital. Can you help analyze the possible cause?
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