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Hi there ...
Thank you for your question ...
As you mentioned he is doing fine , sleeping , eating , no fever just cough , so please keep in mind that kids have little slow functioning of air ways to clear secretions that develops with time , so in this case only thing that need is the steam inhalation , cough syrup and wait .
You are talking about infection that damaged heart so this is very rare and usually happens in those kids who have poor immune system and who has severe form of infection , this is not the case of such issue.
So relax .
Regards ***** ***** luck .
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