This from their website:
The Pennsylvania Center for the Book works with hundreds of children's books each year while preparing booklists, activities, and curriculum materials. Our Family Literacy Activities Web page is designed to help parents and caregivers fill each child's world with a love of books. We consider these 13 titles—a Baker's Dozen—to be the very best picture books published in 2011. They fulfill the goals of family literacy programs across the nation: to create lifelong readers and lovers of books and to start with the youngest audience—preschool children.