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. Tonight, Lucille attends to an unmarried teen mother and Valerie helps her grandmother with an embarrassing medical problem. Mother Mildred tries to help, but ruffles feathers everywhere she goes. Nurse Crane’s back troubles return with a vengeance. Our dear nurses, midwives and nuns get no rest, do they?

Watch it tonight at 8pm on WGBH 2.