Unfortunately, you give me no information about this child, other than the hint that there is complex heart disease. Therefore, all I can tell you is that children with complex congenital cardiac defects typically have a significantly shortened life span without surgical intervention. With surgical intervention, most (but not all) children with these defects have a greatly improved duration and quality of life. That said, it also depends on the type of defect as well as the timing of the intervention. Sometimes, 9 months of age can be too late to intervene to change the outcome, depending on the defect.
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