Therefore the Lord himself will give you a sign. Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel.
Luke 2:7 http://bible.cc/luke/2-7.htm
......And she gave birth to her firstborn son and wrapped him in swaddling cloths and laid him in a manger, because there was no place for them in the inn.
Matthew 1:25 http://bible.cc/matthew/1-25.htm
But he had no union with her until she gave birth to a son. And he gave him the name Jesus.