Meet Mouse. Mouse wants to investigate everything around him. Even his friends don't escape Mouse's attention. Mouse wears a nappy, & he's curious about theirs. So he asks Rabbit, ' What's in your nappy?' One by one Mouse asks all his friends the same question. & when they finally ask Mouse what's in his nappy, the reason is revealed. Join Mouse for a lift-the-flap book with a difference! & have enormous fun learning how to use a potty, identifying different animals & counting too!