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The only thing you can do is to comfort the mother.../ anybody for that matter can only do that
Aggressive symptomatic treatment is all that can be done at this stage...
Side by side, they will be doing investigations to find a curable cause - Myocarditis
is highly possible in view of fever
/ anomalous tracts or arteries, electrolytes and so on are other possibilities...
When the child is stable, some heroic measures may be necessary or attempted.
Wishing speedy recovery