The Holy Guardian Angels
Each person on earth has a guardian angel who watches over him and helps him to attain his salvation. It has been a common theological opinion that this angelical guardianship begins at the moment of birth; prior to this, the child would be protected by the mother’s guardian angel. But this is not certain, and since we now know that the soul is infused at the moment of conception, it may be that the angelic guardianship also begins at that moment. In any case, this protection continues throughout our whole life and ceases only when our probation on earth ends, namely, at the moment of death. Our guardian angel accompanies our soul to purgatory or heaven, and becomes our coheir in the heavenly kingdom.
