I think it is incredibly powerful to teach children about their brains — you can learn some ideas for doing this in the video below.
Resources
Download the My Brain handout for your kids.
How Do You Feel? (free activity from Teachers Pay Teachers)
Engaging Brains: Teaching kids about neuroplasticity
How to Teach Students about the Brain (article for teachers, but great ideas for parents!)
Neuroscience for Kids (how fun does that sound!!)