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My 3 1/2 year old son’s heart beats normal and then fast when heis still is this normal?

mhazeldine2004 said:
I was listening to my heart of children with a stethescope and was sitting on my lap. here the beat of his heart, blow your normal shot, then when it quickly and then would suddenly just beat normal again. This is something that is normal? If any could help answer this for me [...]