I don't know about a baby of two months old. But I have atrial septal defect and I am fifteen yeats old. I was diagnosed with two holes in my heart when I was eleven. But then a year ago when I went for my yearly check up I was told the wholes had been cleared from the operation but I now had ASD. If it gets worse in the child surgery may be needed to replace the valve; if not then it is fine and nothing will need to be done. It just depends on whether the condition worsens.