TH reason that you can see the heart beat through the fontanelles is that intracranial pressure ( the pressure inside your head) fluctuates with each heart beat to compensate for the rise in pressure with each stroke of the heart.
If your baby holds its breath or strains you will see it higher than normal, this is just the increase in pressure.
If it is sunken it often indicates dehydration.
So all in all normal, just though i would give you an explanation instead of just agreeing with the others
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