Two references which maybe useful to start with are:
Chapter 3 'How to Educate Children for Peace' in Perls,L., 'Living at the Boundary' The Gestalt Journal, NY, 1992 and a critique of Laura and Fritz Perls conceptualisation of childhood by Gordon Wheeler in 'Gestalt Therapy Reconsidered', pages 50-57,Garner Press, NY, 1991.
You might also read some of the posts here re the Gestalt Prayer.