There are many ways to help children learn, develop and increase their understanding of the world around them. Talking to them, modeling for them, role playing and giving them positive experiences all are ways to foster their development, encourage positive behavior and prepare them for the many changes in life.
Reading books to children is another great way to introduce something new, encourage healthy development and prepare for transitions. One of my favorites is The Invisible String by Patrice Karst, which helps with separation anxiety and reinforces parent-child attachment. Free Sprit Press http://www.freespirit.com/ , Magination Press http://www.apa.org/pubs/magination/index.aspx, and PACT www.pactadopt.org all have a great variety of books for toddlers to teens about dealing with emotions and preparing for life changes.
Please look at this list that I created to find out my all time favorite books: http://www.skinnyscoop.com/list/parent_coach_sf/top-ten-issue-books-for-children2