أم كلثوم بنت أبي بكر
Ummi Kulthum bint Abi Bakr was the youngest child of Abu Bakr RA, born about eight months after his death. On his deathbed he told Aisha RA to care for her two brothers and two sisters, and when she asked who the second sister was, he said he sensed his wife was carrying a daughter, which came to pass.