** Thanks for contacting with your health concern 1. An ordinary cough with cold is the commonest symptom seen in general practice and because the symptoms have not subsided even after 3 days so it is wise to Consult a Pediatrician or your primary care provider regarding complete physical examination and necessary investigations, don t change or start any medicine yourself without first consulting with your attending Doctor/specialist. PS. Consult an ENT specialist [for quick visual examination of the throat] and for any necessary investigation(s) 2. Hb%, WBC for eosinophilia . X-ray chest for TB, Pneumonia PS. The choice of antibiotic will vary from doctor to doctor, and from locality to locality. 3. Till then: i. Steam Inhalations 3-4 times a day. ii. Warm salt water gargles. [gargle with honey water] iii. avoidance of allergens [dust/cold drinks] iv. take a diet rich in vitamin C (Citrus fruits) and vitamin E which are rich in antioxidants and thus helps in improvement of Thymus function (associated with Immunity.) v. Avoid Heavy, slimy and acidic food, curd, mustard oil, excess physical exertion, sunlight-dust areas, exposure to strong winds, day sleeping, smoking, potato, green leafy vegetables. Cold water/food