The normal platelet index for babies should be 150-300×10^9/L. Reaching 400×10^9/L indicates high platelets, which may be caused by iron deficiency anemia, secondary to infection, Kawasaki disease, rebound thrombocytosis, etc. Parents need to promptly take their children to improve other tests and consult a doctor to clarify the cause. Common causes and treatment 1, iron deficiency anemia: when the baby occurs anemia can appear obvious thrombocytosis, iron for platelet production plays a certain regulatory role. Parents can give their children more iron-containing foods such as pig’s blood, pig’s liver, spinach, etc., but also under the guidance of doctors to give children oral iron preparations; 2, infection: acute infection and chronic infection can cause thrombocytosis, need to determine the type and location of infection through other tests, and give targeted treatment such as antibiotics and antiviral. After the inflammation disappears, the platelet index will usually return to normal levels; 3, Kawasaki disease: if the baby has Kawasaki disease will also appear the symptoms of increased platelets, and may cause damage to the heart, you need to promptly conduct an electrocardiogram, follow medical advice oral aspirin, intravenous gammaglobulin, etc.; 4, rebound thrombocytosis: under the action of certain viruses or drugs, may lead to thrombocytopenia, so that the pro The role of thrombopoietin is to promote the production of platelets, so it can lead to rebound thrombocytosis, which is a physiological feedback phenomenon, after a period of increased platelets can naturally return to normal, so generally do not need to carry out special treatment. The baby should pay attention to the diet structure during the platelet increase, eat more nutritious and light food, avoid overfed or eat spicy and stimulating food. You should also pay attention to rest and take appropriate outdoor exercise to strengthen the immune system.