The normal range of heart rate in children is as follows: 1. The normal range of heart rate in the neonatal period is 120-140 beats/min; 2. 110-130 beats/min for infants less than one year old; 3. 100-120 beats/min for children 1-3 years old; 4. 80-110 beats/min for children 4-7 years old; 5. 80-100 beats/min for children 8-14 years old. If there is a transient high or low, it does not affect the child much, but if it is persistently high or low, a hospital visit is required. If the heart rate is persistently fast or persistently slow, it needs to be considered as a possible result of arrhythmia, and the child’s face should be observed for a range of symptoms, such as fatigue. If there is a heart disease, you need to go to the hospital for a clear diagnosis, and the arrhythmia can be treated with medication.