The reference range of normal blood pressure for children is systolic blood pressure is age*2+80 and diastolic blood pressure is 2/3 of systolic blood pressure. Systolic blood pressure range: greater than 2 years old less than 14 years old, systolic blood pressure is age * 2 + 80. the younger the age the lower the blood pressure. Diastolic range: diastolic blood pressure is 2/3 of systolic blood pressure, the younger the age the lower the blood pressure. Blood pressure should be measured 15 minutes before the measurement. The measurement position is the right upper arm, flush with the heart. Three consecutive measurements should be taken to ensure the accuracy of the results, and the results should be averaged. If the blood pressure is abnormal on a single occasion, it may be related to external factors. If the blood pressure is abnormal on three consecutive occasions, it should be taken seriously. If your baby’s blood pressure is obviously abnormal, you should consult a doctor and follow the doctor’s instructions for rehydration and volume expansion.