Define your book's audience by researching the marketplace. It is imperative to determine the exact audience that would benefit from your children's book because your marketing strategy should surround that audience. For instance, if you've written a picture book about fire safety, you need to reach children ages 2 to at most, 6 years old.
Write articles for periodicals and mention your book in the process to market it. If you have written a children's book about cats, you might try writing an article for a child's magazine and be sure to mention your book in the byline.
Build a website. If you don't have a website, get one. In today's online culture, you must have web presence in order to get noticed. If you are not well versed in web design, you might want to hire someone to design the site while you write the content.
Make direct contact. Going on a book signing tour is one of the most effective ways to market your book. Nothing compares to seeing the author in person.
Enlist help. Most book publishers will have a marketing plan in place for you, but you still may need to hire a publisher. Even with self publishing, marketing plans are available for a fee. If you are not experienced in the marketing end of things, consider investing in someone else to market your book for you.