The value of normal physiological jaundice is usually not more than 12.9mg/dl, if it exceeds 12.9mg/dl, it usually belongs to pathological jaundice. When the baby is born, attention should be paid to keeping warm and feeding as early as possible to supply enough heat to avoid jaundice.1, physiological jaundice: usually belongs to the normal situation, often a transient, mild jaundice phenomenon, generally no obvious symptoms. If a healthy full-term newborn, jaundice will increase 2-3 days after birth, reach a peak in 4-6 days, and gradually subside in 10-14 days. In the case of premature babies, the jaundice will begin to subside in 2-4 weeks, and the baby can be given more warm water and more sunlight to promote the subside of jaundice; 2. Pathological jaundice: usually abnormal, jaundice appears within 24 hours after birth or 4-5 days after birth and lasts for more than 2 weeks, or the jaundice recedes and reappears, accompanied by depression, drowsiness, screaming, loss of embrace reflex, weakened sucking reflex or generalized spasms, etc. . There are more causes of pathological jaundice, such as ABO hemolysis, RH blood group incompatibility, or related to infectious factors, such as pneumonia, lactational hepatitis or other systemic infections, which can cause a persistent rise in jaundice. In addition to these causes, there are also severe malformations of the liver and gallbladder, which can also result in a marked increase in jaundice.