We part of "a virgin shall conceive and bear a son" don't you believe means she was a virgin in birth?
Christ was born from Mary in an entirely miraculous manner, passing from her womb to the world through birth canal and without impact to her virginity, and without causing her the pains of childbirth which are the punishment of original sin for womankind. God did not need to give her super powers to do this, rather, Christ simply passed through her like He walked through the locked door to the upper room after the resurrection. St. Luke 2.7 states that Mary not only brought him forth, but also wrapped him up and laid him in His manger/crib. Not a midwife or St. Joseph, while Mary recovered, but her herself. The implication of the scene is of one utter peace and serenity, not pain, travails, blood, agony, sweat, tears, and crying.
Its also why we call it "The Virgin Birth" and confess in the Creed that He was "born of the Virgin Mary".
