Birth
With regard to the narrations about the birth of Hazrat Abu Bakr (ra), there is an authentic book on the life of the companions according to which Hazrat Abu Bakr (ra) was born two years and six months after Aam-ul-Fil [Year of the Elephant].
(Ibn Hajar al-Asqalani, Al-Isabah fi Tamyiz al-Sahabah, Vol. 4, Abdullah bin Uthman, Abu Quhafah [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2005], p. 145)
It is recorded in Tarikh Al-Tabari and Tabaqat al-Kubra that he was born three years after Aam-ul-Fil.
(Ibn Saad, Al-Tabaqat al-Kubra, Vol. 3, Dhikr Wasiyyat Abi Bakr [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2012], p. 151) (Muhammad Ibn Jarir al-Tabari, Tarikh al-Tabari, Vol. 2 [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah], p. 348)