Parents innately worry about their children's well-being, doing all that they can to protect them from the dangers of this world.
St. John Chrysostom urged parents to extend that desire to their children's spiritual well-being, protecting them from the very beginning of their life from the snares of the devil.
In particular, Chrysostom explained in a homily on First Corinthians how parents should "seal" their children with the sign of the cross.
The cross is among the most powerful spiritual symbols in Christianity, as it reminds Satan of his ultimate defeat.
Whatever you do, make sure to seal your children with the sign of the cross, starting in infancy and teaching them when they get older how to seal themselves with a powerful piece of spiritual armor.