A child is the trust and hope of a family, so the child’s health is one of the parents’ concerns. Some parents find that their children’s heart rate is a little low when they go to the hospital for checkups, so what causes pediatric heart rate to be different from the normal heart rate? Everyone’s heart beats differently, and the number of heartbeats is not only related to age and gender, but also closely related to posture, activity, emotion, and environmental temperature. Therefore, the number of heartbeats of a child may vary within 24 hours of the day. How many times should the normal heart rate be for different ages of children? The average for newborns is 120 to 140 beats/min; 120 beats/min at 1 year old; 110 beats/min at 3 years old; 100 beats/min at 5 years old; 90 beats/min at 7 years old; and it can be reduced to 70 beats/min after 8 years old. Why is the heart rate of a pediatric patient faster than that of an adult? The reason why the heart rate of children is fast and easy to be accelerated by various factors is mainly related to the unsoundness of pediatric neurological function. The younger the age, the faster the heart rate. Children’s heart rate is easily affected by various factors, such as eating, crying, activity, nervousness and other situations, the heart rate can increase significantly. Pediatric fever often causes heart rate increase, body temperature rises 1 ℃, the heart rate can increase 10 ~ 15 times / min. If the heart rate increases significantly, in quiet or sleep can not return to the normal range, often suggests that may be suffering from heart disease, especially when the pediatric performance has a pale face, refusal to eat, night sweats or irritability, or the older children feel suffocated, chest tightness, should take the child to the hospital for examination in a timely manner.