Excerpt from 'Nafasul Mahmum':
Shaikh Mufeed says, that Imam Husayn (a.s.) had six children:
1. (Imam) Ali al Akbar (the elder Ali) (Zainul Abedeen), whose agnomen was Abul Hasan and his mother was Shahezanan, the daughter of Khusroe Yazdjurd.
2. Ali al Asghar (the younger Ali) (popularly referred to as Ali al Akbar), who was martyred at Karbala along with his father... His mother was Layla, the daughter of Abi Murrah bin Urwah bin Mas’ood Saqafi.
3. Ja’far, he did not have any progeny and his mother was from the tribe of Bani Quza’ah. He died during the lifetime of Imam Husayn (a.s.).
4. Abdullah (popularly referred to as Ali al Asghar), who was martyred in his infancy along with his father. He lay in his father’s lap when an arrow came and pierced his neck and he was martyred, while we have quoted regarding him earlier.
5. Sakinah, whose mother was Rabab, the daughter of Imru’ al Qays bin Adi Kalbi. She was also the mother of Abdullah bin Husayn.
6. Fatemah, whose mother was Umm Ishaq, the daughter of Talha bin Ubaydullah.
Imam Ali (a.s.) sent a proposal for the marriage of his daughter Rabab to Imam Husayn (a.s.). She was married to him and she bore him Abdullah (Ali Asghar) and Sakinah.