Because they are young, children are not able to instantly grasp high-sounding concepts and storylines. As such, it is important that while shopping around for books to read your kids, you make a mental note to select books that fit their age. Bookstores often have compartments which indicate books that are suitable for a particular age.
You can make your pick by going through their stock. The books have to be written in simple, interactive language so that the kids can understand them. If they do not, they are more likely to nod off in boredom than gaze at you in magically inspired wonder.