Female genital mutilation (FGM) involves the partial or total removal of external female genitalia or other injury to the female genital organs for non-medical reasons.
The practice has no health benefits for girls and women.
FGM can cause severe bleeding and problems urinating, and later cysts, infections, as well as complications in childbirth and increased risk of newborn deaths.
More than 200 million girls and women alive today have been cut in 30 countries in Africa, the Middle East and Asia where FGM is concentrated (1).
FGM is mostly carried out on young girls between infancy and age 15.
FGM is a violation of the human rights of girls and women.
WHO is opposed to all forms of FGM, and is opposed to health care providers performing FGM (medicalization of FGM).
Treatment of health complications of FGM in 27 high prevalence countries costs 1.4 billion USD per year
I think this has something to do with their culture and tradition.