Your daughter has worked out that if she holds her breath her heart rate slows slightly. She is very clever and observant.The only hesitation I have before saying that this is completely normal and physiological is certain conditions can cause an significant fall in the heart rate while holding one's breath. This includes a condition where fluid accumulates in the pericardium which is the membrane surrounding the heart.I also wonder why she is punching her chest.Does she have a feeling of discomfort in her chest? I suggest that you ask your paediatrician to see her.
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