Many possiblities: Running around. Pain, fever. Excitement. Lots of things. During activity, a child's heart rate can go up over 100 very easily. With vigorous exercise it might be nearly twice that.
Answered 1/15/2014
5.7k views
May be normal: For a five year old normal heart beat 90 to 110. However if you have any kind of rhythm problems, let him be seen by a pediatrician.
Answered 3/9/2013
5.6k views
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