They need:

The Body Book!

I bought this because all in one week my toddler slapped another preschool parent’s a** AND mislabeled my “boob” as my “stomach” (to be fair, there isn’t much delineation there these days LOL). Don’t wait until their kid (or yours) is slapping a**** and mislabeling body parts. Get it now! (BONUS: The cool acetate overlays let you see different bodily systems, one atop the other!)