Patricelli continues her series about a captivating bald baby with two more board-book volumes. Tubby deals with the nightly ritual of a bath that begins with naked time and a chasing game and ends with a clean, dry baby in a fresh diaper. Potty focuses on a toddler milestone: the first time using a potty. After watching what the cat does and the dog does, Baby realizes that humans have traditions of their own. Few book creators today are producing original board books as witty and engaging at Patricelli, and her latest offerings more than live up to her previous ones. (Ages 1–2)