It is common for an 8-month-old to keep coughing for a few days despite taking the medicine. Make sure your daughter takes all medication exactly as prescribed, keep her well hydrated, and use a humidifier or gentle steam to ease congestion. Monitor her breathing, feeding, and temperature, and contact your doctor immediately if the cough worsens, she has difficulty breathing, or the fever persists beyond a few days.

A wet cough with episodes of fast breathing may occur due to a chest infection, airway irritation, or excess mucus in the lungs. Drinking warm fluids, steam inhalation, and adequate rest may help loosen mucus and ease coughing. Avoid dust, smoke, and cold air that can worsen breathing problems. Consult a doctor for proper examination and suitable treatment.