9 months what causes heart murmur

9 months of baby heart murmur may be caused by congenital heart disease, and septal defect, ventricular septal defect, patent ductus arteriosus and other diseases. This symptom may also be heart valve dysplasia, such as mitral valve, tricuspid valve stenosis or closure caused by incomplete. Suggestions: parents can take their children to the hospital for cardiac ultrasound examination to determine the cause.