Most infants have a normal heart rate of 100-130 beats per minute when they are quiet, which gradually decreases with growth and development, and will be relatively fast in preterm infants. Infant heart rate is fast, physiological reasons may be caused by infant crying, exercise, may also suggest the existence of some diseases, such as fever, respiratory diseases, anemia, heart disease and other pathological conditions. Common causes I. Physiological factors: generally heart rate has a certain relationship with a person’s state of mind, the amount of activity. If the infant is crying, too much activity or more hungry, it may cause the heart rate to accelerate. At this time, if you can meet the baby’s needs in time, such as hunger, supplemental food, can play a role in pacifying, so that the heart rate back to normal. Second, pathological factors: 1, fever: pathological cases of accelerated heart rate, the most common fever, fever, the baby’s body temperature rises 1 ℃, the heart rate increased by about 15-20 times / min; 2, respiratory diseases: some respiratory diseases, such as bronchopneumonia, bronchial asthma, etc., will be the first respiratory accelerated, and then caused by accelerated heart rate; 3, anemia: babies with symptoms of anemia, the organism will increase blood circulation throughout the body by accelerating Anemia: if an infant has anemia, the body will increase blood circulation throughout the body by accelerating the heart rate to make up for the lack of oxygen-carrying blood cells; 4, heart disease: infants with congenital heart disease will have faster heartbeats than infants of the same age, such as dilated cardiomyopathy, heart failure, arrhythmia and so on. Treatment for pathological factors caused by rapid heartbeat, generally in the treatment of the original disease after the symptoms will disappear, so it is best to first seek medical attention to identify the cause of the disease, and then standardized treatment. Carefully observe the general state of the infant, such as circulation, urine output, feeding and activity, and seek medical attention if necessary.