Winnie-the-Pooh Chapter 7 in which Kanga and Baby Roo come to the forest and Piglet has a bath,

It is about how the animals in the Forest try to get rid of Kanga and Baby Roo, who are newcomers, but end up becoming friends with them. Rabbit comes up with a plan to kidnap Baby Roo and give him back to Kanga provided she leaves the Forest for good. The plan involves swapping Piglet with baby Roo in Kanga’s pocket where she carries Roo. The deception takes place and the switch is made leaving Piglet in Kanga’s pocket while Winnie-the-Pooh and Rabbit disappear off with baby Roo. Once Kanga arrives home and opens the pocket with Piglet peeping out she realises that they have played a trick on her but she decides to play a trick on them by pretending that she thinks Piglet is her own Roo. Poor Piglet is subjected to a cold bath and a horrible-tasting medicine. Just in time, Christopher Robin arrives and the whole plot is exposed. Piglet makes a dash for freedom and Roo returns home from a wonderful afternoon playing with Rabbit so all ends up well, of course, Kanga and Roo stay in the forest and become great friends with all the other animals.