Here are videos to all the 17 children's books listed in the pre-K-K Kindness Curriculum so generously provided to us by The Center for Healthy Minds, University of Wisconsin.
Two of my favorites, I'm the Best by Lucy Cousins (5/17) and Moody Cow Meditates by Kerry Lee MacLean (7/17) are also suitable for older children (and grownups). Little ones love the musical rendition of How Kind! by Mary Murphy (15/17).
You can download the Kindness Curriculum, with 24 lesson plans, here: https://centerhealthyminds.org/join-the-movement/sign-up-to-receive-the-kindness-curriculum You will need to sign up in order to download.