This is the book The Story of the Root Children. Right now only available in Dutch.
 
The Story of the Root Children (Het verhaal van de wortelkindertjes). From Mother Earth that wakes the sleepy Root Children and encourages them to start making their new spring clothes, to the moment where the Root Children walk towards the light and venture above the ground.
 
About the Author: Sibylle von Olfers
One of the most famous and beloved works of Sibylle von Olfers, now in a new edition.
 
This book introduces nature and the seasons in a poetic way. It combines beautiful illustrations with a simple, yet enchanting story that celebrates the beauty of nature.