The American Girl Bitty Twins Doll Moon & Star Sleeper Midnight Secret Book is a single unit, original product manufactured in 2003 as part of the Bitty Baby franchise. This gender-neutral baby doll accessory features a blue color theme with a sleepwear style, suitable for all occasions. Made of cardboard, this retired piece is designed for any American Girl Doll, Bitty Twins, or Bitty Baby, with a 15-inch compatibility size. Perfect for children aged 5-7 years, this book adds a unique touch to doll sleep time with its moon and star sleeper design.