The Prophet's words were to give hope to a nation (and to the entire world) which was to come under judgment of God. He comforts them by saying, "To us a child is born." Very well, but children were born ... .
And she brought forth her first-born son, and wrapped him in swaddling clothes, and laid him in a manger; because there was no room for them in the inn ... For unto you is born this day in the city of David a Savior, which is Christ the Lord ... ....