From left to right --
Sri Lanka Commonwealth Heads of Government Commemorative stamp when they hosted in 2013. The stamp was issued in 14 Nov 2013. I wish I could find more information about the stamp. I'm curious about the flowers the girl in braids is holding.
Netherlands Child Welfare 2010 stamp from a set of 6. I like the soft lighting and the child not looking directly to the camera.
Another stamp from the Netherlands, this Europa stamp is the right portion of a se-tenant with a continuous design. The left portion can be seen here , the boy is on the microphone piece of this strong telephone. It was issued on 9 May 1989.
Check out the page See it on a Postcards for more children stamps this weekend.