Easter approaches, and for the nuns and midwives of Nonnatus House it's as busy as ever as babies are born to myriad families across the borough. One such delivery brings with it its own set of shocks, as Patsy helps experienced mother Rhoda Mullucks give birth to a baby with severe deformities, with no clear explanation. As the mother refuses to reject her new-born child, the father struggles to come to terms with the harsh realities of his daughter's problems. Support and intervention from Sister Mary Cynthia, Dr Turner and Shelagh proves invaluable as they try to rebuild this loving family. Meanwhile, the new exercise craze has reached Poplar, led by Nonnatus' very own Trixie. As she begins teaching a keep-fit class, she's surprised when the exercises lead to a medical emergency for one of her group. The experience leads her to realise that women sometimes lack a basic understanding of their own bodies, and she aims to rectify it, one patient at a time.