"Prohibited to you (For marriage) are:- Your mothers, daughters, sisters; father's sisters, Mother's sisters; brother's daughters, sister's daughters; foster-mothers (Who gave you suck), foster-sisters; your wives' mothers; your step-daughters under your guardianship, born of your wives to whom ye have gone in,- no prohibition if ye have not gone in;- (Those who have been) wives of your sons proceeding from your loins; and two sisters in wedlock at one and the same time, except for what is past; for Allah is Oft-forgiving, Most Merciful;" - Quran 4:23 (read more)

"Narrated 'Aisha: that the Prophet married her when she was six years old and he consummated his marriage when she was nine years old, and then she remained with him for nine years (i.e., till his death)." - Sahih Bukhari 7:62:64 (read more)

"...it is clear that the circumcision of girls – which is the topic under discussion here – is part of the fitrah of Islam, and the way it is to be done is the method that the Messenger of Allaah (peace and blessings of Allaah be upon him) explained. It is not right to abandon his teachings for the view of anyone else, even if that is a doctor, because medicine is knowledge and knowledge is always developing and changing." - Shaykh Jaad al-Haqq ‘Ali Jaad al-Haqq