1, newborn vegetation generally 2 to 3 days after birth jaundice, 4 to 7 days to reach a peak, the total jaundice red pigment does not exceed 205umol, 7 to 10 days before starting to fall back, generally two weeks after the jaundice should basically recede to normal, at the latest not more than 3 weeks. This jaundice is called physiological jaundice and does not require treatment. 2, the newborn brain barrier is not well developed, when jaundice appears, not only the skin yellow, eyes will be yellow, when the total blood jaundice erythropoietin more than 340umol, with jaundice of the blood flow to the brain is not well developed will also cause brain lesions, and mental retardation. Once the jaundice affects the brain, the child will be left with sequelae due to jaundice. 3, if the jaundice appears early, the course of heavy, 2-3 weeks does not subside, there is poor spirit, less milk, temperature does not rise or fever and other symptoms, suggesting the existence of pathological jaundice. Such as neonatal hemolysis, neonatal infection, breast milk jaundice, hypothyroidism, biliary atresia, etc. It is important to go to the hospital promptly for examination, to clarify the cause and to carry out relevant treatment.