Your son may be starting with a different illness such as croup, but it is more lukely that he has a problem with a post-nasal mucous drip as a result of his recent cold. Keep his nose as clear as possible by using a Sterimar Nasal Spray at least twice a day. If his voice does not return to normal after a few days or if he starts coughing and/or he develops any breathing difficulty he must be seen by a doctor.
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