On CBS News Colorado, we talked to Dr. Immanuel Turner, the Chief of Pediatric Heart Surgery at Rocky Mountain Hospital for Children. He says many times these defects are detected during pregnancy via ultrasound. Dr. Turner says genetics, smoking, and drinking can cause congenital heart defects, however there is still a lot unknown about what causes them.

Watch the entire CBS News Colorado interview

Learn more about heart care at Rocky Mountain Hospital for Children

Learn more about Dr. Immanuel Turner and The Heart Center