The Sea Serpent and Me — Dashka Slater

When a tiny sea serpent tumbles from the bathtub faucet, a little girl finds an unexpected friend. As rainy day after rainy day passes, the two sing songs, take baths, and talk about the sea.
But little girls live on land, and a growing sea serpent needs wave upon wave of water.
Here's a story about the true meaning of friendship, perfect for children, parents, and anyone who has ever had second thoughts about growing up.