The St. Andrew novena begins November 30, on St. Andrew's feast day. Every day until Christmas Eve, the St. Andrew prayer, also called the Christmas Anticipation Prayer, is prayed 15 times. The chaplet helps keep track of the prayers, and is a lovely sacramental. It is piously believed that whoever recites the above prayer fifteen times a day from the feast of St. Andrew until Christmas will obtain what is asked. Many women pray the chaplet in hopes of a new pregnancy.
I just put three brand new chaplets in my Etsy shop, (sorry -- sold out, but I have ordered parts for six more so stay tuned!) so if you are in need of one, please pop over there. The prayer is a beautiful one, and of course can be prayed without a chaplet at all.
Hail and blessed be the hour and moment
in which the Son of God was born of the most pure Virgin Mary,
at midnight, in Bethlehem, in piercing cold.
In that hour, vouchsafe, O my God!
to hear my prayer and grant my desires,
through the merits of Our Saviour Jesus Christ,
and of His Blessed Mother. Amen.