Birth registration is a government's official record that a child was born, and the birth certificate is usually the first document that proves who a person is, how old they are and who their parents are. UNICEF estimates that 77% of children under five worldwide have had their birth registered, up from 75% in 2019, but about 150 million children, roughly 2 in 10, have not. More than 50 million further children are registered but have no birth certificate. Beyond childhood, the World Bank's ID4D initiative estimates that about 800 million people had no official proof of identity in 2024, and that more than half of them are children whose births were never registered.
The gaps are concentrated in poorer countries. In sub-Saharan Africa only 51% of young children are registered, and in Eastern and Middle Africa just 41%. Birth registration opens the way to vaccines, health care and schooling, and adults without an ID can be unable to vote, get a formal job, open a bank account or use health care. In the 2025 ID4D–Global Findex survey, about 41% of adults without an ID said they could not buy a SIM card, which also cuts them off from mobile money. At the extreme are stateless people, who have no nationality at all. UNHCR counted 4.5 million stateless people at the end of 2025 and says the true number is likely much higher, because many stateless groups are never registered.
How legal identity is defined and measured
The UN Legal Identity Agenda defines legal identity as the basic facts of a person's identity, such as name, sex, and place and date of birth, conferred through civil registration of the birth and the issue of a certificate. Where a birth was never registered, a legally recognised identification authority can confer it instead. SDG target 16.9 calls for legal identity for all, including birth registration, by 2030. Four measures are used:
Birth registration of children under five
SDG indicator 16.9.1 is the share of children under five whose birth has been registered with a civil authority. In most low- and middle-income countries it is measured with household surveys such as MICS and DHS, which count a child as registered if the family shows a birth certificate or reports that the birth was registered.
Birth certificates
Registration and certification are not the same. A child can be on the civil register without the family ever receiving a certificate, which is the document needed to prove the registration later. UNICEF counts more than 50 million registered children who lack one.
Official proof of identity
The World Bank's ID4D Global Dataset estimates how many people of all ages have no official ID. The 2025 edition draws on survey questions about ID ownership in the 2024 round of the Global Findex survey, and more than half of the people it counts are children whose births were never registered.
Statelessness
UNHCR reports the number of stateless people known to governments and to UNHCR. Because many stateless populations are not registered anywhere, the reported figure is a minimum, not an estimate of the true total.