Happy birthday Mama Mary!

The traditional date of the feast, September 8, falls exactly nine months after the feast of the Immaculate Conception of Mary. Perhaps because of its close proximity to the feast of the Assumption of Mary, the Nativity of the Blessed Virgin Mary is not celebrated today with the same solemnity as the Immaculate Conception. It is, nonetheless, a very important feast, because it prepares the way for the birth of Christ.

Source:http://catholicism.about.com/od/holydaysandholidays/p/Birth_of_Mary.htm