Rex's parents have decided to adopt a little boy. Nervous about being forgotten when the new baby arrives, Rex rushes about making herself indispensable as Number One Big Sister. That's all well and good, except that her best friend Pinky is beginning to feel neglected because Rex won't do anything that isn't related to the baby. The resourceful Pinky brings a present to baby Matthew--a soccer ball, which Rex will have to break in. Luckily, Rex's mother recognizes that Rex is devoting a little too much time to her new brother and sends her off to play ball. The latest in Howe's series of Pinky and Rex books, this is a short, easy chapter book with engaging watercolors. It will be a solid, useful purchase for collections serving children who are learning to read, as well as transitional readers. (Reviewed Mar. 1, 1993)