Factors that might increase a baby's risk of developing atrioventricular canal defect before birth include:

  • Down syndrome
  • German measles (rubella) or another viral illness during a mother's early pregnancy
  • Alcohol consumption during pregnancy
  • Poorly controlled diabetes during pregnancy
  • Smoking during pregnancy
  • Certain medications taken during pregnancy — talk to your doctor before taking any drugs while you're pregnant or trying to become pregnant
  • Having a parent who had a congenital heart defect
Aug. 14, 2015