How many days does it take to take blue light for neonatal jaundice is generally determined by the condition of neonatal jaundice fading, and the treatment cycle is usually around 3-7 days. Newborn jaundice is mainly divided into physiological jaundice and pathological jaundice, physiological jaundice generally do not need special treatment. Pathological jaundice needs active treatment in order to prevent other complications in the later stage, and blue light is a common treatment means, the recovery is relatively fast and can be discharged from the hospital in 3-5 days, and if it is more serious, the time may be longer. When a newborn has jaundice, it is recommended to have more sunshine, more milk, more stools, which is conducive to the discharge of bilirubin in the body, and if it does not ease, it should seek medical attention promptly.