It does sound as if the mucous is in your son's chest already. Most children of this age will cough up the mucous and then swallow it. They do not know how to spit out this mucous. It will help your son if you give him a medicine such as Mucospect which will help him to cough up the mucous.Also keep his nose clear by using a saline nasal spray for children such as Sterimar twice a day.
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