About 85-90 percent. The real unknown, but about 15 percent are caused by.1. infection of mothers found that the mother is infected.(Rubella), etc.2. the mothers received medication during pregnancy such as medication, take a hold.Hormonal drugs or medication, calm nervous group of mothers causes of alcohol use.Children from several diseases such as heart disease (VSD ventricular septal defect,) and shoes (atrial septal defect, ASD) (pulmonary stenosis, PS) (transposition of.great arteries, TGA)3. illness of the mother, such as mother, as.Diabetes, heart disease or motherBut its origins have his heart disease, but the origin of 3 – 4%Etc.4. the genetic abnormalities, such as a break.Of chromosome abnormalities
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