Seven months pregnant, Mel is dumped by her partner and left stranded outside her first antenatal class. And so the expectant mother believes that she is about to face parenthood alone. Instead, Mel finds herself introduced to the world of pain relief and labour positions with a group of women who quickly become valuable friends in the terrifying new world of motherhood. Each of these women has a different kind of complicated life, but as mums-to-be the five discover together that preparing for the birth of a baby is one time when every woman needs four new friends.