Sneak Peek: 'Call the Midwife' Returns for Season 9 on PBS (PHOTOS)

The medics and midwives of Nonnatus House encounter new challenges as the population shifts, rules change and old diseases return on Season 9 of Call the Midwife.

In the opening episode, which premieres Sunday, March 29 on PBS, Dr. Turner and Nurse Crane must deal with an alarming outbreak of diphtheria. Fred finds an abandoned baby in a dustbin, and the team must help locate its mother.

The following Sunday, Fred and Sister Monica Joan catch a woman stealing the team’s milk. When they learn she’s pregnant, they bring her into the care of the maternity home. Romance blooms between Miss Higgins and Sergeant Woolf.

Call the Midwife, Season 9 Premiere, Sunday, March 29, 8/7c, PBS (Check your local listings)