How does two many months darling cough to have phlegm to do

Two-month-old baby cough sputum, first need to take the child to the hospital pediatrics in time to see a doctor, blood routine, c-reactive protein, chest X-ray and other examinations, if it is a cold, under the guidance of the doctor to use antibiotics or antiviral drugs and cough expectorant drugs active treatment, usually need to let the child drink more water.