Another Dr. Seuss book that is exceedingly popular with toddlers, One Fish, Two Fish, Red Fish, Blue Fish has Seuss’ great rhymes, and also throws in counting for good measure. Since toddlers are learning how to count, and how each number of an object has to be counted, they’ll love counting in this book. Also, Dr. Seuss drew some of the best illustrations when it comes to toddler appeal. They are brightly colored, and sufficiently silly to make a toddler laugh out loud.