Birth certificate in the context of "Sex assignment"

A legal name or wallet name is the name that identifies a person for legal, administrative and other official purposes. A person's legal birth name generally is the name of the person that was given for the purpose of registration of the birth and which then appears on a birth certificate (see birth name), but may change subsequently. Most jurisdictions require the use of a legal name for all legal and administrative purposes, and some jurisdictions permit or require a name change to be recorded at marriage. The legal name may need to be used on various government issued documents (e.g., a court order). The term is also used when an individual changes their name, typically after reaching a certain legal age (usually eighteen or over, though it can be as low as fourteen in several European nations). A person's legal name typically is the same as their personal name, comprising a given name and a surname. The order varies according to culture and country. There are also country-by-country differences on changes of legal names by marriage. (See married name.) Most countries require by law the registration of a name for newborn children, and some can refuse registration of "undesirable" names.

The birth name is the name of the person given upon their birth. The term may be applied to the surname, the given name or to the entire name. Where births are required to be officially registered, the entire name entered onto a births register or birth certificate may by that fact alone become the person's legal name.

Sex assignment (also known as gender assignment) is the discernment of an infant's sex, typically made at birth based on an examination of the newborn's external genitalia by a healthcare provider such as a midwife, nurse, or physician. In the vast majority of cases (99.95%), sex is assigned unambiguously at birth. However, in about 1 in 2000 births, the baby's genitals may not clearly indicate male or female, necessitating additional diagnostic steps, and deferring sex assignment.

In most countries the healthcare provider's determination, along with other details of the birth, is by law recorded on an official document and submitted to the government for later issuance of a birth certificate and for other legal purposes.

Civil registration is the system by which a government records the vital events (births, marriages, and deaths) of its citizens and residents. The resulting repository or database has different names in different countries and even in different subnational jurisdictions. It can be called a civil registry, civil register (but this is also an official term for an individual file of a vital event), vital records, and other terms, and the office responsible for receiving the registrations can be called a bureau of vital statistics, registry of vital records and statistics, registrar, registry, register, registry office (officially register office), or population registry. The primary purpose of civil registration is to create a legal document (usually called a certificate) that can be used to establish and protect the rights of individuals. A secondary purpose is to create a data source for the compilation of vital statistics.

The United Nations General Assembly in 1979 adopted the Convention on the Elimination of All Forms of Discrimination Against Women, Article 16 of which requires countries to establish compulsory civil registration of marriages. Most countries have a legal requirement for relevant authority to be notified of certain life events, such as births, marriages and deaths. The first country to establish a nationwide population register was France in 1539, using the registers of the Catholic Church. Sweden followed in 1631, on the basis of a register drawn up by the Church of Sweden on behalf of the Swedish king.