There are 28.9 million children under the age of five in the U.S. and all of them will need to be toilet trained. This classic book has already helped millions of parents get their children through a life milestone with ease and some entertainment too. With , a parent reads the book to their child or allows the child to read it while on the potty. Not surprisingly, the book takes some wear. This new edition will withstand such heavy use. The four sound buttons cover the essentials, with a dose of amusement: a trumpet fanfare for success; kitty meows (is it a milk bowl?); birds singing; and the flush-it's-all-gone finale. The three AG-13 button cell 1.5V batteries are removable and replaceable, and access is childproof. Since 1975, has been THE potty training book. It has it all: bright graphics, simple language, a fun story and an anatomically correct hero. With an edition for each gender, the book relates directly to the child, making potty-training relatable and easy to understand. More than four million copies have sold worldwide.