SDG #16 is to “Promote peaceful and inclusive societies for sustainable development, provide access to justice for all and build effective, accountable and inclusive institutions at all levels”
Within SDG #16 are 12 targets, of which we here focus on Target 16.9:
By 2030, provide legal identity for all, including birth registration
Target 16.9 has one indicator:
Indicator 16.9.1: Proportion of children under 5 years of age whose births have been registered with a civil authority, by age
The countries with the lowest rates of registered births as of 2022 were in the Horn of Africa, with Ethiopia and Somalia, each with less than 6%. The worldwide share as of 2018 was 72% of registered births.