There is a high indirect bilirubin concentration (8 mg/dl out of the total 10 mg/dl) so there must be a problem with conjugation. the enzyme needed for conjugation is UDP-gluronosyltransferase.
In this case, this is physiological neonatal jaundice. due to immature enzyme that resolves without treatment in 1-2 weeks.
pg 387 FA 2019
Babies don't have mature activity of this enzyme when first born...Tx with phototherapy...not same mechanism as enzyme but makes bilirubin more soluble