Look for books that have large, colorful pictures, large words, and repetitive phrases. Ideally, the photos should be descriptive and “match” the sentence. One good example is “Duck, Duck Goose.”
Your toddler will soon get the idea that the words are related to the photos, and once he memorizes the sentences, will be able to “read” along with you. One good example is “Brown Bear, Brown Bear, What do you See?”