According to the National Institutes of Health, Medline Plus, the normal resting heart rate or cardiac rate for children, who are three to four years old, ranges from 80 to 120 beats per minute. Any major deviations from the normal heart rate can indicate a medical condition.
To determine a child's heart rate, an adult finds the pulse at the neck or wrist and counts the beats for one minute. For accurate results, take the pulse after the child has rested for 10 minutes. If the pulse rate is continually higher than the normal values, this is called tachycardia. If the pulse rate is continuously below the normal values, it is called bradycardia. Consult a pediatrician regarding abnormally high or low resting heart beat rates. The National Institutes of Health, Medline Plus, states that a fast cardiac rate may indicate an infection or dehydration.