This comprehensive guide explains neonatal jaundice, a common condition in newborns caused by elevated bilirubin levels. It covers causes including prematurity, feeding difficulties, and immature liver function, and describes measurement methods using transcutaneous bilirubinometer or heel prick tests. The document provides essential information on when to seek medical attention, treatment options like phototherapy, and practical care advice including ensuring adequate hydration and breastfeeding frequency while emphasizing the importance of follow-up appointments.