The Bible doesn't specify when Mary, mother of Jesus, was born so any assignment of a birth date is simply speculation.
Catholic Answer:
The date of the birth of Mary is not known but her nativity is celebrated on September 8.
January 1 - Solemnity of Mary
January 8 - Our Lady of Prompt Succor
February 2 - Presentation of the Lord
February 11- Our Lady of Lourdes
March 25 - Annunciation
May 31 - Visitation
June 27 - Our Mother of Perpetual Help
July 16 - Our Lady of Mount Carmel
August 15 - Assumption
August 22 - Queenship of Mary
September 8 - Birth of Mary
September 12 - The Most Holy Name of Mary
September 15 - Our Lady of Sorrows
September 24 - Our Lady of Walsingham, England
October 7 - Our Lady of the Rosary
October 8 - Our Lady of Good Remedy
November 21 - Presentation of the Blessed Virgin Mary
December 8 - Immaculate Conception
December 12 - Our Lady of Guadalupe
September 8 is the feast of the Nativity of Mary.
The date of Mary's birth is unknown but celebrated on September 8.
December 12th is the Feast of Our Lady of Guadalupe.
The feast of the Assumption is on August 15.
Mary's feast is probably September 16.it is her birthday according to tradition.
The Nativity of the Blessed Virgin Mary is celebrated on September 8 although the actual date is not known.
The Nativity of Mary.
The Feast of the Mother Of God is on January 1'St.
September 6.
The date of Mary's birth is unknown but it is commemorated on September 8.
September 8th
Solemnity of Mary is celebrated on the 1st Of January
September 8 is the feast of the nativity of the Blessed Virgin Mary.
We celebrate our lady help of christians feast day because we praise and honour our lady help of christians (aka virgin mary or mary mother of god)