An atrial septal defect is a birth defect of the heart in which there is a hole in the wall (septum) that divides the upper chambers (atria) of the heart.
To treat this recite Darood-Shareef 11-times, then 11,000 times:
فَاَوْحیٰ اِلٰی عَبْدِہٖ مَآ اَوْحیٰ مَا کَذَبَ الْفُوءَ ادُ مَا رَاٰی
followed by 11 times Darood-Shareef in one sitting (maybe by one or more persons collectively). Then blow upon 1/2 kilo pure natural honey. From this honey according to the child age give the appropriate dose to the child 3-times a day; once in the morning, once in the evening and once at night.
For small kids and infants the dose should be a small amount on the tip of the finger and for children over 10-years it should be one tea-spoonful at a time. This treatment is to be continued for six months.