Call the Midwife never shies away from difficult or controversial topics, because nurses and midwives must deal with all that nature and society presents them IRL. Tonight, Mother Mildred decides it’s time for Sister Frances to attend her first solo birth. Trixie consoles a patient who discovers she has gonorrhea and Sister Monica Joan follows Great Britain’s Olympic hopes.

Watch it tonight at 7pm on WGBH 2.