Treatment for children with tumors is usually given in “rounds and rounds”. The chemotherapy period is followed by a rest period to allow the body to recover the blood cells (white blood cells, red blood cells, platelets, etc.) that have been killed by the chemotherapeutic drugs, in preparation for the next round of chemotherapy. Whether white blood cells, hemoglobin, or platelets, after chemotherapy will go through a “bottoming out” process. As a general rule, the lowest levels of white blood cells, red blood cells, and platelets occur on days 7-14 after the end of chemotherapy, which is the red area in the figure. This time period represents the period of the most pronounced bone marrow suppression, during which life-threatening complications such as infections and bleeding are also particularly likely to occur, requiring particularly careful care and the need to seek medical help if the white blood cell count is less than 1.5 (×10^9/L) or the absolute neutrophil value is less than 0.5 (×10^9/L), and a doctor needs to be consulted as to whether it is necessary to The value of hemoglobin is lower than 70g/L, it is necessary to consult the doctor whether it is necessary to transfuse red blood cell suspension; 3. Platelet count is lower than 30 (×10^9/L), or continuous rapid decline, or blood petechiae and ecchymosis of the skin, nosebleed, bleeding gums, etc., it is necessary to consult the doctor whether it is necessary to make an appointment for platelet single-collected platelets for transfusion; 4. The appearance of fever (body temperature> 38.3℃, diarrhea, etc.), it is necessary to consult the doctor whether it is necessary to make a booking for single-collected platelets for transfusion; 4. 38.3℃), diarrhea, abdominal pain, frequent vomiting, coughing, shortness of breath, mouth ulcers, difficulty in eating and other symptoms may represent the occurrence of infection, also need to consult a doctor; The above need to consult a doctor, can only write out the most common cases, other cases can not be listed. We generally recommend that routine blood tests be performed every 2-3 days after discharge from the hospital at the end of chemotherapy, and daily routine blood tests are needed by the time bone marrow suppression becomes apparent to help the doctor determine the condition and anticipate trends in blood changes. Generally speaking, two weeks after the end of chemotherapy, the white blood cell, hemoglobin and platelet counts will gradually rebound (green area in the figure), and the child’s resistance will be restored, and all kinds of medical risks will be reduced accordingly, and the child will be relatively safer. In fact, in the treatment of tumors, pure chemotherapy drugs do not cost much, but if complications such as infections and bleeding occur after chemotherapy as mentioned just now, then the cost and difficulty of treatment is very huge, and some infections and bleeding can be fatal, so nursing and medical care during the rest period are equally important. We hope that every child will go through the chemotherapy and rest period successfully.