<s>[INST] What causes infant jaundice? [/INST] Following are some of the possible reasons leading to jaundice:

An underdeveloped liver. Very common and mostly not a reason to worry about.
Some form of internal bleeding
Blood infection of the infant
Enzyme malfunction or deficiency
Abnormal red blood cells that break down more than usual
Mother's blood is not compatible with her baby. This causes the baby to receive antibodies from mother that trigger break down of RBCs.
Any other bacterial or viral infection
A baby who is not being sufficiently breastfed may develop jaundice Source: Medifee. Link: https://www.medifee.com/faq/Jaundice. Field: Hepatology . Disease: Jaundice </s>