Children On Stamps

Thailand
Children's Day
January 13, 2024
The minisheet depicts a cartoon style drawing of children with balloons.

Republic of Korea
Children's Day
May 4, 2022
The stamp shows happy faces of children.

Sri Lanka
World Children's Day
October 1, 2022
The stamp shows happy children at play.

Japan
Nostalgia of Pictures for Children I
September 18, 2015
The stamp set features classic drawings of children.

Japan
Nostalgia of Pictures for Children III
May 27, 2016
The stamp set features classic drawings of children.

International Year of the Child, designed and engraved by Claude Andréotto and issued by Mali in 1979:

Liechtenstein
Children Future Secure
March 4, 2024
The stamp marks 75 years of the SOS Children's Villages organization.

Panama
Children Welfare
November 1, 1986
The stamp set celebrates 20 years of Children's Village program.

Namibia
SOS Child Care
August 6, 1993
Set of four, one stamp shows children.

Denmark
SOS Children's Village
January 12, 2005
The stamp shows a group of children.

Netherlands
Children Stamps
November 7, 2006
The minisheet is entitled Safe Future.

....probably, You will need to make some "folders" and separate this topic "Children on Stamp" to few folders.
Probably You know, that some countries, issue once per year, stamp under topic "Children Year/Week" and other have it under name "Joy of Europe", than we have a lot of stamps with vaccine on it as topic, which will have children on stamp too, than we have "Bienale" issues (Czechoslovakia) where children are visible on stamp, or even some religious issues where You can find it too.

I will show one sample of "Joy of Europe", with drawing - children there too and it come from Serbia:
Scott catalog # 403, single stamp issued with slightly higher catalog value of 1.75 US$ per single stamp.

International year of the child, issued by DDR on May 22, 1979:

Meeting of UNICEF in Latin America, issued by Chile on February 11, 1971:

Rio Muni SC#8 1960 5Pts