EWTN Catholic Q&A
Virgin Mary
Question from Jim on 10-15-2012:

Is it true that the Virgin Mary had no sin, and why? Was she born in sin?

Answer by Richard Geraghty on 10-21-2012:

Dear Jim,

Mary was conceived without the stain of original sin because she was to be the Mother of God. God saw to it that the mother of his Son would be perfect as no other creature was.

Dr. Geraghty