If You Have a Hat by Gerald Hawksley, picture e-book, published in 2011.

A whimsical rhyming picture book, If You Have a Hat, is perfect for preschoolers. The language is simple and fun, so early readers can also enjoy reading it themselves. The illustrations are clear and bright, and sometimes a little silly. The man eating peas was a favourite of my boys. I liked the hippo in the bath myself. I enjoyed reading this book with my boys, and watching them giggle.