Long before Jennifer Worth's memoirs were filmed, she spotted Miranda Hart and knew that she would be perfect to play Chummy Browne, the six-foot-tall, ungainly, clumsy midwife who features in her books. Miranda agreed to take the role of Chummy if the books were ever filmed.
The midwives are based in Nonnatus House, which is named after St. Raymond Nonnatus (nonnatus being the Latin for "not born") who was born by Cesarean section, and is the patron saint of pregnant women and childbirth.
Nonnatus House is a pseudonym for The Community of St. John the Divine, an Anglican religious order of nuns founded in London in 1848. The order relocated to Birmingham in 1976, and ceased to practice midwifery in 1990.
The newborns on the show are a mix of 4 prosthetic babies including a tiny premature baby, a full term baby, a mixed race baby, & anatomically correct baby with interchangeable parts, & 20 or so live babies around a week old.