The repeated rise and fall of jaundice in newborns can be considered as hemolytic disease, erythrocytosis, as well as hemorrhagic disease of organs, metabolic disease, etc. Further examination is recommended. 1. Hemolytic disease: if there is ABO hemolytic disease or Rh hemolytic disease, it can lead to repeated destruction of red blood cells in newborns, resulting in repeated pathological jaundice. 2. Erythrocytosis: if there is hereditary erythrocytosis, the red blood cells in the body will be too much, the blood will be too viscous and the red blood cells will be ruptured constantly, resulting in repeated jaundice. 3. Visceral hemorrhagic disease: In addition, if the newborn is squeezed by the birth canal during delivery, it may lead to intracranial or visceral hemorrhage, resulting in a large number of red blood cells destroyed and causing jaundice. In addition, it is not excluded that the repeated jaundice is caused by other diseases such as galactosemia etc. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give the targeted treatment under the guidance of the doctor.