Allah made special arrangements so that Hazrat Fatima (S.A) would be born pure in body and in spirit. Allama Majlisi, a well-known scholar, reports in his book Bihar-AI-Anwar ("The Seas of Light"), that before Hazrat Fatima (S.A) was conceived in her mother's womb, the Archangel Gibrael came to the Prophet (S.A. W.W.) telling him that Allah wished him (the Prophet) to stay away from his wife Khadija for forty days. He did as he was told.
On the fortieth day, Gibrael came back to congratulate the Prophet (S.A. W.W.) for the heavenly gift that he was about to get from Allah Then came the Angel Michael with heavenly food, letting the Prophet (S.A.W.W.) know that it was Allah's wish that on that night the Prophet (S.A.W.W.) should break his fast with the heavenly food. The Prophet did what Allah wished He broke his fast with the dates and grapes from heaven.
After that, the Prophet was told to go to his wife Hazrat Khadija. They stayed together. Hazrat Khadija became pregnant that night. Hazrat Fatima (S.A) was thus conceived in her mother's womb that night.
One of the miracles of Hazrat Fatima is: while she was still in her mother's womb she spoke with her! The Sunni Scholar, Abdulrehman Shafie says in his book, "Nuzhat Al-Majils", that Hazrat Khadija said, "When I was pregnant, she would speak with me from within my womb”.
Another Sunni Scholar and historian called Shah Abdul Aziz Dahlawi reports in his book, 'Tajhiz Al-Jaish", the following incident:
“When Khadija was pregnant with Fatima, Fatima used to speak to her mother from her mother s womb Khadija kept this secret from the Prophet"
"One day the Prophet found Khadija talking to someone though there was no one around in the house. He therefore asked her about it. She replied, 'The one who is in my womb speaks with me’.
Then the Prophet said, "Be happy Oh! Khadija. For the one in your womb is a girl who will, by command of Allah be Mother of eleven of my successors... "
Another Sunni Scholar called Shuab B. Saad Al Misry, adds to the above incident, saying that Hazrat Fatima (AS) while still in her mother's womb would give courage and hope to her mother Khadija when Khadija was feeling sad.
Source:
A Brief Biography of Hazrat Fatima (a.s.), [P.3-4].
By: M.M. Dungersi Ph.D.