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I went through your post
acoustic trauma can occur with one off exposure to loud music
But it need not always result in damage
Just observe your daughter
at 5 months of age she would have developed good head contro
if no damage has occured she should turn towards to the direction of sound
You can do this test and see if she is turning towards the direction of sound
Then there is no need to worry
her hearing is fine then
She might not have sustained any serious damage
you can test her hearing later once she grows up
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