The normal value of jaundice in a 40-day-old baby is below 6 mg/dl. If the child’s jaundice is above 6mg/dl, it is not considered physiological jaundice, because physiological jaundice, full-term babies recede 2 weeks after birth, while premature babies generally slowly recede clean in 3-4 weeks, consider the possibility of pathological jaundice. There are more causes of pathological jaundice, including hemolytic jaundice, infectious jaundice, etc. It is necessary to take the child to the pediatric clinic of the local public hospital in a timely manner and, if necessary, to improve the blood routine, liver function and other related tests to clarify the cause of pathological jaundice, and then to further treat the cause and reduce the yellowing symptomatically.