By E. B. White
It will break your child's heart, so gently that they'll want to read it again.
Wilbur the pig learns what happens to spring pigs in winter. Charlotte, the spider in the doorway of his barn, decides it will not happen to him — and starts writing words in her web.
Here's where the trail starts asking a little more of your child's heart. It's the first book on it that really makes them feel something big. And there is no safer, more loved book to do that with. Generations of children have cried over Charlotte and come out completely fine, because White is so gentle about the whole thing.