After the last lesson, Mr. and Mrs. Xiao Li rested for 2 years, and after coming out of the pain of losing their son, they had a new baby, the child was born, and at the age of 3 days, the child developed jaundice again, this time the whole family was particularly nervous and asked the doctor to transfer the child to the intensive care unit for observation at the first time, after Dr. Zhang checked the room, he carefully analyzed the child’s condition, the general condition is now good, the mother’s blood type is also The mother’s blood type is not O, and the jaundice value is low, which is in line with physiological jaundice. Considering the situation of the last child, Dr. Zhang reassured Mr. and Mrs. Li that we will monitor the jaundice index for your child every day, and if it continues to rise and reaches the diagnostic criteria for pathological jaundice, we will treat the child at the first opportunity. Physiological jaundice: It is a neonatal jaundice in the early neonatal period when serum unconjugated bilirubin is high to a certain range due to the metabolic characteristics of bilirubin. It is a transient physiological high unconjugated bilirubinemia in the course of normal development. 1, clinical manifestations: full-term infants mostly appear 2-3 days after birth, 4-5 days to peak, jaundice lasts 7-10 days to subside. Premature infants can be extended to 2-4 weeks. The degree of jaundice varies, with mild cases limited to the cheeks and severe cases involving the trunk, extremities and sclera. Fecal color yellow, urine color is not yellow, generally asymptomatic. 2. Diagnostic criteria: (1) Full-term infants: total serum bilirubin <102.6 μmol/L (6 mg/dl) at 24 hours, <153.9 μmol/L (9 mg/dl) at 48 hours; <220.6 μmol/L (12.9 mg/dl) at 72 hours and later. (2) Preterm infants: total serum bilirubin <136.8 μmo l/L (8 mg/dl) at 24 hours, <205.2 μmol/L (12 mg/dl) at 48 hours; <256.5 μmol/L (15 mg/dl) at 72 hours and beyond. In addition to serum bilirubin as an important diagnostic basis, it must be combined with etiology and clinical manifestations when differentiating physiological and pathological jaundice clinically. In premature infants with hypoxia, acidosis, hypothermia, and late feeding, serum bilirubin is within the physiological range, but there is also a risk of nuclear jaundice. In some newborns, serum bilirubin is beyond the physiological range and has reached hyperbilirubinemia, but no causal cause can be found, so it may still belong to physiological jaundice. 3, laboratory tests unconjugated bilirubin is increased, and its increased physiological range value varies with age. Their erythrocytes, hemoglobin, and reticulocytes are within the normal range. There is no bilirubin or excess urobilinogen in the urine, and the liver function is normal. 4.Treatment Generally, no special treatment is needed, reasonable feeding, most can subside on their own. Early breastfeeding and adequate feeding can help reduce the degree of physiological jaundice. After a few days of observation, the jaundice subsided smoothly without any special treatment, and Mr. and Mrs. Xiao Li took their child home with peace of mind. Moreover, there was no reduction in breast milk due to mother-infant separation, and they made an appointment to see Dr. Zhang and brought their child to the hospital for a review in 3 days.