Neonatal jaundice is one of the most common symptoms and signs in newborns. It has the following factors: 1. It cannot appear too early, 2-3 days after birth can appear, not within the first day, if jaundice appears within the first day, there is a very serious problem, there are many causes. 2-3 days appear, 5-7 days to the peak, before half a month to subside, is the most normal performance of jaundice; 2. The peak jaundice can not be too high. If the jaundice exceeds 12.9mg/dl, then the child’s jaundice is abnormal and also needs to go to the hospital for continued observation, or light treatment. Jaundice treatment is mainly blue light phototherapy, normal sunlight or ultraviolet light can be helpful.