The Nonnatus team grow increasingly concerned for the welfare of four young children. Sister Catherine faces her first solo delivery, and the midwives attend a women's lib meeting.

A new medical technique threatens to change the face of obstetrics forever, whilst a potential rabies outbreak has Poplar in a state of fear. Cyril meets Rosalind's parents.

Rosalind's skills are tested when she is drawn into an unusual domestic case. Joyce is seconded to the hospital and befriends a single mother with a rare blood group.