Leo is a young lion who feels a bit strange because he's about to get a new sister. His friends are no help, they just say that once his little sister is born Leo won't be the most important anymore. He'll have to let her pull his whiskers and pounce on his tail, and let her win all the races, because babies are always crying and the grown-ups feel sorry for them. And if he doesn't want to make the grown-ups angry, he mustn't make the baby cry. But what Leo most hates is that she might take away his crown so that he's not the king of the jungle anymore. That would be the worst thing. But when the day finally comes and he meets his sister, Leo realises that his mum looks after her just like she looked after him when he was a baby, and that if he let his sister wear his crown, she would feel like the king of the jungle, but he could still be king too. He realises that feeling left out when a new baby comes is very normal.