If there is no genetic predisposition for tetralogy of Fallot in the first child, there may be a second child with a healthy baby, and if there is a genetic predisposition, there is a higher likelihood of developing tetralogy of Fallot in the second child.
If the couple does not have the genetic gene for tetralogy of Fallot, the presence of tetralogy of Fallot in the first child may be due to changes in the condition caused by viral infections, environmental factors, medications, and various other disease-causing factors, and the second child may be a healthy baby after removing these disease-causing factors.
If both spouses have a genetic predisposition for tetralogy of Fallot, the risk of developing tetralogy of Fallot in the second child is significantly higher if the first child is tetralogy of Fallot. Counseling at a genetics clinic is needed for the doctor to determine if the birth of a child with the disease can be avoided through three-generation IVF techniques.