The classic book that is entirely about what happens when you wish: Five Children and It, by E. Nesbit, published 1902. Nesbit had a firm grasp on the main reasons children read, and each chapter explores what happens after certain wishes are fulfilled.
The moral of the story: Be careful what you wish for! Also, simply having your wishes come true doesn’t mean you’re going to be happy. Every outcome has unpredictable consequences. Other people are always caught in your life web — you can’t make a personal wish without it affecting your community.