Our expert says:
the crackling sound is caused by phlegm in the small airways. You did exactly the right thing by steaming him. Bronchiolitis causes a wheezing or whisteling sound. If this happens your doctor should have another look at him. If he looks fine, has no fever, does not complain of short breath, you can continue with expectorant. But keep him indoors if very cold outside and avoid too much activity.
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