Sara has some interesting history on how Pride Month came to be; Nicole has some resources for you to check out.
History of Pride Month: https://www.them.us/story/the-complete-history-of-pride
LGBTQ+ Children's Literature: https://csulb.libguides.com/childrens/lgbtq
Stonewall Book Awards: http://www.ala.org/rt/rrt/award/stonewall/honored
Great LGBTQ+ Books for kids and teens: https://www.readbrightly.com/9-great-lgbtq-books-kids/
YA Books: https://www.epicreads.com/blog/lgbtq-ya-books-pride/ and http://www.yapride.org
