On the back of this book it says:

There are five books of Yip and Yannika stories. This is one of them. Young children are immediately drawn in and fascinated by the clarity, spontaneity and humor of Annie M.G. Schmidt's stories about the ordinary - but oh so adventurous - lives of the preschoolers Yip and Yannika. The stories are wonderfully complimented by Fiep Westendorp's illustrations. The Yip and Yannika books are classics (more than a million have been sold), but also living books, and an essential part of every child's book collection.