It looks like the characters on Call the Midwife are about to see some change in the world as they change with it.

Cast Members Were Crying During Rehearsal Of 'Call The Midwife'

On Tuesday, Radio Times posted an interview with series creator Heidi Thomas who said that "the world's changing, one woman at a time." Even though things won't stay the same now that everyone is going to experience the 1960's, it's going to be a process that will require some patience.

"The world didn't go from black to white to color at midnight on the 1st January 1960," Thomas said. "Throughout the series we've been addressing this very slow and gradual progression of social change, which ultimately will ignite into something much bigger in the middle of the 1960s. At the moment we're seeing those sort of changes being played out on a personal level."

'Call The Midwife' Character Will Be Back To Go 'From One Extreme To The Other'

The creator then explained how she sees women connecting with the world they're living in, which gives her a good haul of ideas to play with.

"I am in the business of telling stories about the experience of women in the 20th century- that's my personal manifesto- about the way women's lives connected with the state and with society and the way their relationships work out within the domestic personal setting as well," Thomas shared. "When you look at it like that, it's like this wonderful Rubik's cube of possibilities."

Call the Midwife Season 4 is expected to premiere in the United States this spring on PBS.

Tags: Call The Midwife television PBS