There are two possibilities for a baby to have a heart murmur, one is caused by a congenital heart condition and the other may be a physiological murmur. A heart murmur is an abnormal sound produced by the vibration of the ventricular wall, valves or blood vessels caused by the abnormal flow of blood in the heart or blood vessels during contraction or diastole, in addition to the normal heart sounds. A murmur is not necessarily related to heart disease. A murmur found on auscultation does not mean that the heart has organic disease, and organic heart disease does not necessarily have a murmur. Therefore, if you find a murmur in your child’s heart, you can’t confirm the diagnosis of heart disease, and you need to do further tests such as cardiac ultrasound to confirm the diagnosis. Heart murmurs can be heard in congenital heart disease or in healthy people. Congenital heart diseases that can be heard with a more pronounced heart murmur include relatively simple congenital heart diseases such as patent ductus arteriosus, atrial septal defect and ventricular septal defect, as well as complex congenital heart diseases such as tetralogy of Fallot. Children or adolescents are prone to physiologic murmurs, which are not indicative of heart disease but are functional, such as those that may be heard after exercise or during fever or anemia. Physiologic murmurs are characterized by being softer, shorter in duration, lower in intensity, and not transmitted to distant locations. Therefore, if your baby has a heart murmur, it is recommended to go to a regular hospital for a cardiac ultrasound to confirm the diagnosis.