Not a few days after the baby is born, often the skin begins to turn yellow, and the color will get heavier over time, but some babies slowly recede in color, while some babies’ skin remains yellow …… Today, share with you the mystery of neonatal jaundice. The causes of neonatal jaundice Neonatal jaundice has different degrees of performance in different babies, and the reasons why each baby gets neonatal jaundice are not the same. The reason your baby’s skin is yellow is because of high levels of a pigment called bilirubin in the blood. Each of us has bilirubin in our blood, which is usually removed from the blood by the liver and then excreted in the stool. It is your liver that cleans up your baby’s bilirubin before he is born, and it takes a while for his liver to take over this job after he is born. Therefore, the pigment in your baby’s blood will accumulate, causing this yellow color to appear on the skin, also known as “neonatal jaundice”. This type of neonatal jaundice is called “physiologic jaundice” and usually peaks 2 to 3 days after birth when the baby is lame and Zheng reaches 4 to 5 days, and naturally subsides within two weeks. For premature babies, neonatal jaundice usually peaks 5 to 7 days after birth and may take up to 2 months to slowly subside. This yellow color tends to appear initially on the baby’s face, then spreads downward a little to his neck, chest and then down to his limbs. In some very unusual cases of neonatal jaundice, the yellow color may spread all the way to the baby’s toes. Which babies are more likely to get neonatal jaundice? Babies with the following conditions may be more likely to develop significant neonatal jaundice than other babies: (1) have older brothers or sisters who have had neonatal jaundice; (2) have bruises at birth where the blood red blood cells in the bruises break down, causing an increase in bilirubin; and (3) are born prematurely. The liver of a premature baby may be underdeveloped and have a low capacity to metabolize bilirubin in the blood.