My son is 22 months old now, and we've read this book over and over again. There are images of a little girl and her baby sibling. She is hiding, throwing, sliding, running, and doing other fun things that will appeal to most toddlers.
The text, with lines like "see how I can throw!" and "or do balancing tricks, with one foot in the air!" doesn't follow a predictable, repeating pattern. Nevertheless, when I said one line of the text to my son (with the book nowhere in sight), he ran into his room and retrieved this book!
This is a memorable book that has made an impression on my son. I bet other children of his age will like it as well.