Pediatric blood pressure is different at different ages during childhood, and usually the younger the age, the lower the blood pressure. The normal value of blood pressure in children of different ages can be calculated using the formula: systolic blood pressure (mmHg) = 80 + age x 2, diastolic blood pressure should be 2/3 of the systolic blood pressure, and the conversion between mmHg and kPa is mmHg measured value divided by 1.5 = kPa value. If the measured blood pressure value is more than 10% higher than the blood pressure value calculated based on the child’s age it should be considered a case of hypertension. In general, the most common causes of hypertension in children are kidney diseases, such as acute glomerulonephritis and nephrotic syndrome. If the blood pressure is low, it is usually low when there is an infectious shock, or a heart problem. When measuring blood pressure, you should choose a cuff of different widths according to your age, generally the width of the cuff should be 1/2-2/3 of the upper arm length, the blood pressure measured when the cuff is too wide is lower than the actual value, when it is too narrow is higher than the actual value. Make sure that the child is in a quiet state and does not do strenuous exercise or drink carbonated beverages during the measurement. Blood pressure is mostly measured by Doppler ultrasound monitors or cardiac monitors in newborns, and the simple tidal method can also be used. The simple flush method is used to determine the blood flow by observing the newborn’s body as well as the face to roughly estimate the amount of blood pressure. In summary, the normal range of blood pressure and the cuff width required to measure blood pressure in children are different from those in adults, and therefore need to be measured under the guidance of a pediatrician.