When a baby is born with severe deformities of the kind later identified as caused by the drug thalidomide, the midwives find it difficult to handle the situation, and the baby's father rejects her completely, to his wife's dismay. Trixie's new sideline as a keep fit instructor brings her into conflict with Sister Julienne, and she also becomes suspicious of the relationship between Barbara and Tom. Rather than return to Wales as her mother wishes, Delia moves into Nonnatus House.
Poetry In Motion (Rerecorded) — Johnny Tillotson
Trixie & Barbara help Denny photograph the people of the East End by convincing their patients to posses with them; Patsy patients, Rhoda, struggles with labour pains.
Diana — Paul Anka
Rhoda rings out the family washing when Belinda comes into the kitchen looking for a place to do her maths, Rhoda makes Perry make space for her.
Girl from Petaluma — Cocktail Shakers
Trixie teaches her inaugural 'Keep Fit' class with the girls attending, Denny photographing and Olive commentating; (repeats) Trixie teaches her class again when Olive noticeably becomes hurt.
Gopher — Yma Sumac
Trixie, Barbara, Patsy and Sister Monica Joan break Lint with eclairs; Trixie teaches her 'Stay Fir' class with the others in attendance along with Sister Monica Joan and Olive commentating.