Some historians say that she was born five years before the Prophet announced his Prophethood, but the more reliable historians and scholars such as Kulayni and Shahr Ashub say that she was born five years after Hazrat Muhammad (S.A.A.W) had told the people that he was their Prophet.
She was born in Mecca on 20th Jamadiul Akhar on Friday 615 AD.
Muffazzal Bin Omar, a companion of Imam Jaffer Sadiq (AS) asked the Imam to tell him about the birth of the Imam’s Grandmother, Hazrat Fatima (S.A). What follows is a summary of what the Imam told Muffazal.
Hazrat Khadija (Hazrat Fatima’s mother) was advised by her friends and women of Kuraish not to get married to Hazrat Muhammad (S.A.W.W.), but she did not follow their advice. As a result they were very angry with her and stopped visiting her.
When the time of the birth of Hazrat Fatima came near, she called them to help her deliver the child but they all refused to come. At that time four beautiful though strange looking women came to help Hazrat Khadija. They introduced themselves as Hawwa (Nabi, Adam’s wife), Kulthum (Nabi Musa’s sister), Mariam (Nabi Isa’s mother), Asia (The Pharo’s wife). They told Hazrat Khadija that Allah had sent them to help her in the delivery of the child.
The child was then born She read the Qalma" and went into the “Sajda”.
Source:
A Brief Biography of Hazrat Fatima (A.S.), [P.4].
By: M.M. Dungersi Ph.D.