It's March 1970. The team support a pregnant teenage girl whose parents believe in an immaculate conception. Demonstrations cause havoc for the Nonnatus team, whilst Nancy’s relationship blossoms.

Rosalind requires all her skills as a midwife when a disabled baby is delivered at the maternity home, whilst a gas explosion in an old tenement building shocks the community.

The Sisters welcome new postulant, Sister Catherine, to Nonnatus House, whilst a bold intervention boosts numbers for the measles vaccination clinic.

Joyce faces a difficult situation when a mother suffers postnatal complications, a council strike leads to an outbreak of Weil’s disease, and Cyril’s life is turned upside down.

The midwives help a family with a history of drug addiction. Dr Turner and Shelagh take the final steps in May’s adoption, whilst Joyce faces the disciplinary board.

It’s April 1970. Rising rates of gonorrhoea in the district cause alarm, and Trixie cares for an unmarried first-time mother recently diagnosed with a mental health condition.

Dr Turner experiences the biggest test of his career, while Trixie’s approaching nuptials cause stress levels to escalate. Sister Julienne hatches a plan to save Nonnatus House.

Sister Julienne cares for an expectant mother who has cerebral palsy. Nonnatus House kicks off its new midwifery training scheme with the arrival of four new pupil midwives.

The team help a single mother whose flat is riddled with damp whilst Nancy and Dr Turner care for a Sylheti woman with an undiagnosed illness, and Matthew teaches Trixie how to drive.

Nurse Crane helps a struggling first-time mother accept her baby’s birth defect, and Violet’s bid to be mayor is thrown into turmoil by unforeseen circumstances.

Trixie makes a serious mistake at work, whilst the team work hard to help a Biafran family. Nancy delves into her family’s past as the world celebrates the moon landings.

A fun day at the seaside proves traumatic for the Turners and puts May’s future with them in jeopardy. Nurse Crane helps a young couple cope with a rare cancer diagnosis.

In his new role, Cyril faces his toughest challenge yet, whilst Matthew is summoned to a board meeting with his mother. Elsewhere, the pupil midwives prepare for their final exams.

Rosalind oversees the care of a teenage mum and uncovers a disturbing truth. Trixie and Matthew struggle with their change in fortune whilst Joyce receives an unexpected visitor.

A solo delivery puts Sister Julienne’s skills to the utmost test. The Nonnatus team oversee the care of a man living inside an iron lung, and Cyril returns from Jamaica.

November, 1970. The challenges of midwifery hit close to home when a mother and baby home is evacuated. Nancy’s wedding plans take a surprising turn, and Sister Catherine takes her first vows.

Mother Mildred decides it’s time for Sister Frances to attend her first solo birth. Trixie consoles a patient who discovers she has gonorrhea.

Jenny is seconded to a short-staffed hospital in London, but grows increasingly reluctant to carry out her duties when she finds out she is working under intimidating surgeon Mr Tracey. Back in Poplar, the midwives are introduced to newcomer Jane and outspoken twins Meg and Mave Carter. The sisters are identical in every way, except one of them is now pregnant - forcing them to come to terms with the impact a baby will have on them.

Miss Higgins receives an unexpected visitor, and Sister Monica ruffles feathers. Poplar votes for its Mother of the Year.

Nonnatus House prepares for the annual summer fête, but when a baby show is announced, the girls must find a host for the proceedings. Meanwhile, a patient of Jenny's puts her life at risk, and Sister Bernadette remains troubled.

The midwives face one of their busiest nights to date, whilst Sister Winifred concentrates her efforts on the prostitutes of Poplar. Elsewhere, cracks start to appear in Trixie and Tom Hereward's relationship.

The Nonnatus team rallies to support first-time parents Marie and Tony Amos when Tony is arrested for gross indecency with another male. Elsewhere, as Poplar is gripped by an outbreak of dysentery, Trixie undertakes her first official church duty since her engagement to Tom.

Jenny Lee start her midwife career at Nonnatus House in London. She is surprised to find that it is a nursing convent and not a hospital. Her first case is a woman pregnant for the 25th time!

When Peggy’s brother is diagnosed with cancer, Jenny and the nuns are called upon to care for him. Jenny gets to know the siblings better. The Nonnatus House residents get involved in Fred’s latest money-making scheme which involves a pig called Evie.

The winter continues, and the team at Nonnatus House welcome their newest midwife, Lucille Anderson. Nurse Crane and Dr Turner care for an elderly cancer patient facing eviction.