One day Amma tells Sona she is going to have a baby. Is that good? Sona isn't sure – she has always enjoyed being an only child – and straight away she has a word with her best friend, Elephant.
When Sona learns that there will be a baby naming ceremony, she is determined to find the perfect name for her new brother or sister. Because although she realises that her life is about to
change, and while she's having some difficulty in coming to terms with having to share everything with the new baby – including Amma and Appa, her grandparents and her home – Sona Sharma wants to be the very best big sister she can be.