As your child is learning to read, it will be important to find just right books for him/her to read. Let your child look at any books that interest them. Read them books that are beyond their reading level so they continue to expand their vocabulary, but also provide them with a lot of books that are decodable. Decodable means that the majority of words that they are reading contain familiar concepts. If you child is learning how to read short vowel words, then the books should have a majority of short vowel words and not have a lot of concepts that they haven't been introduced to yet.
In the Reading Room we are building a decodable library for our students to access. They can "check out" books and take them home to read and bring them back when they are ready for a new one. This is a developing process, but we have a good start.
Here are other sources that you can access to find decodable books: