Muhammad's wives
Muhammad was monogamous for 25 years. After his first wife Khadija bint Khuwaylid died, he proceeded to marry the wives listed below, and most of them were widows. Muhammad's life is traditionally delineated as two epochs: pre-hijra (emigration) in Mecca, a city in western Arabia, from the year 570 to 622, and post-hijra in Medina, from 622 until his death in 632. All but two of his marriages were contracted after the Hijra (migration to Medina). Of Muhammad's thirteen wives, at least two, Rayhana bint Zayd and Maria al-Qibtiyya, were referred to simply as concubines; however, there is debate among Muslims as to whether these two officially became his wives. Of his thirteen wives, only two bore him children, a fact which has been described as "curious" by Cornell University Professor of Near Eastern Studies David S. Powers.
Muhammad in Mecca
Muhammad consented to the marriage, which by all accounts was a happy one. Khadija was not only Muhammad's wife, but also his friend and confidante and later his moral support. After his wedding, Khadija gave Muhammad the slave boy Zayd ibn Harithah. Ibn Ishaq records that Khadijah bore Muhammad six children: a boy named Qasim, who lived only two years, then four girls Zaynab, Ruqayyah, Um Kulthum, Fatimah and finally a boy named Abdullah, who also died at two. According to some Shi'a scholars, Fatimah was Muhammad's only daughter. The combination of the death of Abdullah, and his desire to relieve his uncle Abu Talib of the burden of a large family, as Abu Talib was already in great financial difficulty, led Muhammad to take his uncle's son Ali into his own home. Muhammad also adopted Zayd, giving him the name "Zayd ibn Muhammad" (meaning Zayd son of Muhammad). However, owing to the adoption revelation from Allah, later verses were revealed stating clearly that a child, especially after adoption, could not be treated as a natural son by marriage or inheritance. Consequently, the adopted child had to retain the name of his or her biological father. Therefore, Zayd could not be known as the son of Muhammad, but the son of his father, Haritha, and be known as Zayd ibn Haritha. In Quran : 33:40 "40. Muhammad is not the father of any man among you, but he is the Messenger of Allâh and the last of the Prophets. And Allâh is Ever All-Aware of everything. "