For younger children (that is, children who can't read yet), you're going to have to read that book anywhere from once to several hundred times, out loud. Look for books that have interest for an adult, even though they are children's books.

One of my favorites is "The Bravest Ever Bear". I think a 7-year-old would get a lot of enjoyment out of it. It's not STEM at all (though an interesting engineering problem does show up).