We've had a couple of these in my family. It usually means the child has a small hole in their heart, known as a Septal Defect. Some need to be closed surgically, some don't need closed, just watched. Outlook is usually excellent with proper treatment either way.
Read more by keyword searching
Atrial Septal Defect or Ventricular Septal Defect
Or go to the American Heart Association links for each here:
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