Eric Carle is one of the most celebrated childrens book authors/illustrators of all time, with over 103 million copies of his books sold worldwide. Inspired by the classic book, The Very Hungry Caterpillar, this clip-on book all about numbers will become your babys favorite! The book has great activity features on each page, crinkle texture inside, a teether on the cover, a squeaker, and a hanging clip so your baby can have fun and learn anywhere!