I'm standing up against child marriage
Child marriage is any formal or informal marriage of a girl or boy under the age of 18. It affects girls far more than boys, and it is still very common around the world.
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According to Girls Not Brides, a child under the age of 18 is married every 3 seconds.
The Convention on the Rights of the Child sets out rules against it. So does Article 16 of the Universal Declaration of Human Rights, adopted by the United Nations in 1948. It says people must be of "full age", considered to be 18, when they marry, and that marriage must be entered into "freely" and with "full consent".
Even so, countries are still not enforcing these basic human rights for children.