I think your first title sounds lovely, but it may give too much away.
I just looked through some of the books in my PB collection and it appears the majority of the titles are a bit vague leaving more to discover when the content of the story is read. Some reveal the hook straight away. Most titles say more about the subject than the story, like Toy Boat, Olivia, Stars. However, I found a couple of them that give-away/are the hooks, Mary Ann Hoberman/Kevin Hawkes And To Think That We Thought That We'd Never Be Friends, and Karma Wilson's/Jane Chapman's Bear books, Bear Wants More, Bear Snores On, etc. So I think it depends. If the first Bear book were just titled "Bear," it would sound more like a non-fiction title.
I changed the title of one of my PB's from what the content was about to the hook. After reading it at a workshop, an editor revealed that I should change it back. I did and it sold and the title was left as-is.
Going with your first inclination could be the catalyst to spark interest and the change can be made afterward if necessary.