Looking for digitized children's books can be challenging. Try the following websites:

• International Children's Digital Library 
  A digital library of children's books from around world. The collection's focus is on identifying materials that help children to understand the world around them and the global society in which they live. The materials in the collection, all presented in the original languages in which they were published, reflect similarities and differences in cultures, societies, interests, and lifestyles of peoples around the world. Some titles are in English
• StoryPlace
  ​StoryPlace is compatible with desktop and mobile devices. The site also includes early literacy information for parents and caregivers.
• MagicBlox
  ​From their website, ‘With a large and growing collection of eBooks for kids 1 to 13 years old, your children get to enjoy new books all the time from award winning authors and publishers from around the world.  In addition to titles you are familiar with from traditional publishers, they also have the opportunity to discover new stories from authors they've never heard of, or try out new languages they've never seen.’ One book a month for free, monthly passes for a cost.