What is jaundice? Jaundice is a common clinical symptom, which refers to elevated levels of bilirubin in the human body, leading to yellowing of the skin, whites of the eyes and other phenomena. Neonatal jaundice refers to jaundice that appears within one week after birth and usually lasts for 1-2 weeks. Because the liver function of newborns is relatively weak, and the hemoglobin metabolism of newborns is relatively fast, the synthesis, transport and excretion functions of bilirubin are different from those of adults, so they are prone to jaundice. What level of jaundice is normal? new