Is It Normal for a Newborn to Not Have Jaundice at Birth?

The newborn did not have jaundice at birth, but 28 days later, the child’s white eyes became yellowish and persisted for several days. Today, after a urine test at the hospital, the doctor only informed that the jaundice index was high and that blue light therapy was needed. I would like to ask if the jaundice value is indeed very high and if hospitalization or other medication treatments are necessary.
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