I recently came across something which stated that the soul of St. John the Baptist was sanctified prior to birth at the Visitation.
New Advent says the following:
The soul of the precursor was not preserved immaculate at its union with the body, but was sanctified either shortly after conception from a previous state of sin, or through the presence of Jesus at the Visitation.newadvent.org/cathen/07674d.htm
Denzinger (Sources of Catholic Dogma) cites the Profession of Faith of Durand of Huesca saying the following:
421 By the heart we believe and by the mouth we confess that the Father also and the Son and the Holy Spirit, one God, concerning whom we are speaking, is the creator, the maker, the ruler, and the dispenser of all things corporal and spiritual, visible and invisible. We believe that God is the one and same author of the Old and the New Testament, who existing in the Trinity, as it is said, created all things from nothing; and that John the Baptist, sent by Him, was holy and just, and in the womb of his mother was filled with the Holy Spirit.archive.org/details/TheSourcesOfCatholicDogma
Thoughts on this?
I do not recall seeing this in any Catechism or Catholic Biblical Commentary I have read, though I suppose it is possible I have somehow missed it. Furthermore, the article from New Advent that I linked above provides no source for that statement. Ott does not mention it in Fundamentals of Catholic Dogma at all.