I completely oppose it and think its child abuse, however coming at it from a cultural context it is legal in Saudi Arabia although the restriction is placed on only when the child begins menstruating they are defined as a "woman".
A member of the Majiles, Mohammad Ali Isfenani has been reported to argue based on the prophet Muhammad who was known for doing the same thing.
"We must regard 9 as being the appropriate age for a girl to have reached puberty and qualified to get married. To do otherwise would be to contradict and challenge Islamic Sharia law.”
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Madness ! But Iran isn't known for its sanity. So yeah sucks for these girls who will any raped by their sixty years old husbands and who will do the same thing to their daughters because well, at one point its become "normal" and even OK to do this. And this madness will be perpetuated for generations and no one will protest anymore because eventually people will get used to it and Iran isn't really the most democratic country and prostesting can be a bit risky for your well being. So yeah, sucks for the girls.0