As infants and children grow, their normal heart rate changes. For instance, the normal heart rate for a child age 1 - 2 years old is 80 - 130 beats per minute; the normal heart rate for a child 3 - 4 years old is 80 - 120 beats per minute; the normal heart rate for a child age 5 - 6 years old is 75 - 115 beats per minute; the normal heart rate for a child age 7 - 9 years old is 70 - 110 beats per minute; and the normal heart rate for a child age 10 years and older is 60 - 100 beats per minute.
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At rest, it should be between 65 and 73. Exercising, it should be around 135. On average it should be around 100, a little more or less is fine, though.
The boy's average heart rate will fall some as he ages, so take note of that.
Every 4-year-old is different. There is no average or normal pulse for a 4-year-old.
The normal, resting heart rate of a 4 year old child is between 80 and 120 beats per minute. If the child is very active, they will be closer to or under 80 beats per minute consistently.
I believe it should be about 90 beats per minute. That's what my 4 year old heart beat usually is.