Jaundice at 5 days of age may be physiologic or pathologic. However, if the bilirubin level is high, it is mostly pathologic jaundice, which can be treated by general treatment, medication and other ways. 1. Physiological jaundice: for preterm babies, physiological jaundice often occurs 3-5 days after birth, and most of the jaundice will subside in about 1 week, and the longest time will not be more than 2 weeks. At this time there is no need for special treatment, to ensure that the baby enough milk can be. Probiotics can also be given as prescribed by the doctor to promote the discharge of stools and bilirubin. 2. Pathological jaundice: When the baby’s daily bilirubin rises more than 85 μmol/L after 5 days of life or the serum bilirubin of the preterm baby is more than 257 umol/l, then the diagnosis of neonatal hyperbilirubinemia can be made. At this time, you can go to the hospital to give your baby blue light phototherapy, alkalinization of the blood to reduce the yellow, if necessary, can be supplemented with albumin, gammaglobulin or blood replacement therapy to treat the disease. The baby was born 5 days jaundice if the level is high should be timely medical treatment, in accordance with the doctor’s instructions to be targeted treatment.