UNESCO declared 1979 to be the International Year of the Child, itself commemorating 20 years since the Declaration of the Rights of the Child. The year aimed to draw attention to issues affecting children around the world, including preventing malnutrition and improving access to education.
The second link below shows a lovely selection of stamps that were issued in different countries in recognition of the Year.
https://en.wikipedia.org/wiki/International_Year_of_the_Child
https://www.postbeeld.com/stamps/various/year-of-the-child-1979
Stamp of the Day 