According to WikiPedia:
Where the Wild Things Are is a 1963 children’s picture book by American writer and illustrator Maurice Sendak, originally published by Harper & Row. The book has been adapted into other media several times, including an animated short in 1974 (with an updated version in 1988); a 1980 opera; and a live-action 2009 feature-film adaptation, directed by Spike Jonze. The book had sold over 19 million copies worldwide as of 2009, with 10 million of those being in the United States.
Below is an animated reading of the book via YouTube for you to enjoy with your child/ren: