June is dedicated in a special way to devotion to the Sacred Heart of Jesus
June 28 is the feast of the Sacred Heart.
Here are the pages on the Sacred Heart from The Loyola Kids Book of Catholic Signs and Symbols by Amy Welborn.
Click on each image for a larger version.
As you can see, the structure of the book is: for every entry, the left-hand page features a beautiful illustration and a brief definition. On the facing page, you will find a longer explanation, suitable for older children.
More about the book - and the others in the series - here.