I’ve written a number of articles about various aspects of chess for young children. You can read some of them here. They were written between 10 and 25 years ago: in some ways my views are slightly more nuanced now.
FOURTEEN FALLACIES ABOUT JUNIOR CHESS
CHESS THINKING SKILLS IN CHILDREN
PRIMARY SCHOOL CHESS SINCE 1975: AN OVERVIEW (1998 article)
CHESS AND SPECIAL NEEDS EDUCATION
Here’s an interview: