Normal baby’s lungs are free of murmurs when auscultated with a stethoscope, if the stethoscope hears murmurs suggesting inflammation of the lungs or airways. If sputum sounds are heard consider acute bronchitis, if wheezing sounds are heard consider wheezing bronchitis, capillary bronchitis or bronchial asthma, etc. If a tiny blistering sound is heard, consider that the baby has bronchopneumonia. It is up to the pediatrician to distinguish which murmur is the right one and then make a diagnosis of the disease. If the parents hear a murmur by ear, it is mostly a sputum or wheezing sound at this time, because the blistering sound can only be heard with a stethoscope. Therefore, it is important to ask the doctor in detail which kind of murmur is in the baby’s lungs and consider which kind of disease it is.