As a newly qualified midwife, Sister Catherine visits her first solo patient, who is experiencing persistent nausea. Meanwhile, Nurse Crane, Trixie, Rosalind, and Joyce participate in a women's liberation meeting.

It's 1971, and a new era dawns with the Women’s Liberation movement in the UK. As the year unfolds, the team faces serious cases, including a premature birth, slavery, carbon monoxide poisoning, male breast cancer, child abuse, and lupus. 

Call the Midwife follows the nurses, midwives and nuns from Nonnatus House, who visit the expectant mothers of Poplar, providing the poorest women with the best possible care.