Three month old baby spitting bubbles with or without fever, nasal congestion, runny nose, cough and sputum. If so, a respiratory infection cannot be ruled out and a hospital visit is recommended so that the doctor can auscultate the lungs. If there are dry and wet rales, a chest X-ray is recommended, and blood tests are performed if necessary to determine the degree of infection. Take oral anti-inflammatory, cough suppressant and phlegm-relieving medication, and pay attention to keeping warm and avoiding cold. Pay attention to a light diet, eat more easily digestible food, and avoid spicy and stimulating food. Try to go out as little as possible and not to go to crowd gathering places to avoid cross infection and aggravation of the disease.