What are causes of Neonatal Jaundice?

"Jaundice is caused by quite a few reasons in babies and the commonest reason what we call is the physiological jaundice which means that the jaundice happens in a normal newborn baby and there may not be any other reason than the baby being abnormal or liver being immature or they may be getting more blood from the mother. But sometimes we call it as a pathological jaundice, which means if the jaundice happens before 24 hours of age or if the jaundice is much more higher level, then it is called as a pathological jaundice. Then we have to investigate the baby"