The report released by the UNICEF, highlights the importance of data in making progress for children and exposing the unequal access to services and protections that mars the lives of so many.
"Data have made it possible to save and improve the lives of millions of children, especially the most deprived," Tessa Wardlaw, Chief of UNICEF's Data and Analytics Section said in a statement.
"Further progress can only be made if we know which children are the most neglected, where girls and boys are out of school, where disease is rampant or where basic sanitation is lacking," it said.
According to the report, some 90 million children who would have died before reaching the age of 5 if child mortality rates had stuck at their 1990 level have, instead, lived. In large measure, this is because of progress in delivering immunisations, health, and water and sanitation services.
The report states that primary school enrolment has increased, even in the least developed countries. While in 1990, only 53 in 100 children in those countries gained school admission, by 2011 the number had improved to 81 in 100.