Diseases and Conditions

Tetralogy of Fallot

Risk factors

While the exact cause of tetralogy of Fallot is unknown, some things might increase the risk of a baby being born with this condition. Risk factors for tetralogy of Fallot include:

  • A viral illness during pregnancy, such as rubella (German measles)
  • Drinking alcohol during pregnancy
  • Poor nutrition during pregnancy
  • A mother older than age 40
  • A parent who has tetralogy of Fallot
  • The presence of Down syndrome or DiGeorge syndrome in the baby