No one loves a birthday more than a child. In fact, most children are so eager to reach their next age milestone, they want everyone to know how incredibly close they are to reaching it. From exclaiming "I'm this many!" to "I'm four ... and a half" to "I'll be six next week" to "I'm almost nine", kids express their anticipation of each turning point.The Birthday Number Books capture a child's thrill of becoming a year older by providing a customized book for boys and girls age one to ten. The text and art are tailored for each age level, and the books grow increasingly challenging and sophisticated each year. The content of each book explores things that relate to the title number. For example, the four-year-old's birthday book explores facts about nature, science, history, the arts, and geography that relate to the number four, such as a four-leaf clover and the four-stage metamorphosis of a butterfly. There are also some recurring entries throughout the series, such as the planets in the solar system (the fourth from the sun is Mars).As a birthday bonus, each book ends with a feature called "And One To Grow On" -- a silly riddle pertaining to the book's birthday number. The riddle for The Fabulous Number 4 is: "What do you get when you cross poison ivy with a four-leaf clover? A rash of good luck!" Each book also has a self-contained cardboard frame on the back cover to personalize the book with the birthday child's picture.These educational and entertaining titles will become a collection in the bookcases of children everywhere as parents, friends, and relatives give their favorite kids a book that's perfectly suited for the best day of every year -- their birthday.