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The heart is slow. Less than 60 is bradycardia
ECG is necessary to document. Most times, 24 hours monitoring (Holter) is needed.
Fluttering may or may not be related to the heart / it could be muscle twitching too...
You must see a cardiologist - that is the only way.
Physical examination and investigation alone will shed light.
At this age, congenital heart disease
Wishing speedy recovery