HTML for Babies is a recently released board book with 16 pages. Each pair of facing pages shows a different fragment of code. All are simple enough that they can be used to introduce a toddler to the language of the future.
Now I don't have kids, but I am planning to get this book. The opportunities for humor are endless, and not just for giving it to a toddler. This book would make an excellent birthday gift for a programmer in training, a college freshman, or anyone learning the basics. Heck, i might keep one on my shelf just to hand out whenever I am asked for a reference book on HTML.
You can buy it on Amazon for $9. Sorry, but there's no ebook version available.