Jaundice is generally divided into physiological and pathological, but a simple baby with yellow feet in good condition can be observed to see. In physiological jaundice, it will appear in 7-14 days, especially the eyes are more yellow, the feet will be worse, there are no clinical symptoms and the general condition is good. Serum bilirubin does not exceed the normal value, which is physiological jaundice. Pathological jaundice, which continues to worsen within 24 hours, is also clinically symptomatic and the serum bilirubin exceeds normal values. This condition must be treated actively and symptomatically at the hospital to identify the jaundice in detail to avoid further aggravation of the condition. The first thing is treatment, to light therapy and liver protection, which is the most critical. Therefore, if you find persistent aggravation of jaundice, you must be hospitalized for symptomatic treatment without delay.