1, within 2 weeks after birth jaundice to distinguish between physiological and pathological jaundice; 2, 2 months after birth still jaundice, it is best to identify medical jaundice and surgical jaundice (biliary atresia), because surgical jaundice requires active early management, after 3 months can not be Kasai surgery. Its main method is early cholangiography. Taiwan and Japan use fecal card screening methods for early initial screening, with some effect: 3. The etiology of cholestatic jaundice due to medical disease is quite complex, including genetic and metabolic diseases, and some require early dietary intervention, so the diagnosis should still be established in a timely manner, but the screening diagnosis is complex, and some can only be performed in more advanced children’s hospitals.