Mucinex Children’s Cold & Flu All in One is a Multi-Symptom Relief medicine for your child’s cold and flu symptoms. Mucinex Children’s Cold & Flu helps control cough and relieves sore throat, stuffy nose, chest & nasal congestion, headache and minor aches and pains. Mucinex Children’s is the #1 Pediatrician Recommended Brand*. It is available in Very Berry flavor. It is to be used for Children 6 years and over. This product contains 4 FL OZ and a dosing cup. SYMPTOMS RELIEVED: Mucinex Children’s Cold & Flu helps control cough and relieves sore throat, stuffy nose, chest & nasal congestion, headache and minor aches and pains. ACTIVE.