Child marriage is a formal marriage or informal union entered into by an individual before reaching a certain age. This is specified by several global organizations such as UNICEF as minors under the age of 18. The legally prescribed marriageable age in some jurisdictions is below 18 years, especially in the case of girls; and even when the age is set at 18 years, many jurisdictions permit earlier marriage with parental consent or in special circumstances, such as teenage pregnancy. In certain countries, even when the legal marriage age is 18, cultural traditions take priority over legislative law. Child marriage violates the rights of children; it affects both boys and girls, but it is more common among girls.