The movie is based on the book of the same name by Amy Koppelman, who has also directed, written and produced the film, and stars Oscar-nominee Seyfried as new mum Julie.
In the trailer, which you can watch above, children's book writer Julie and her husband Ethan, played by Ratched actor Wittrock, are shown enjoying spending time with their new baby. However, as Julie narrates a story to Ethan, it becomes clear that she is struggling with depression.
Julie is shown lying in a hospital bed and suffering from panic attacks, while she explains that "the stars were starting to disappear from the sky".
As she later unveils a new book that she has written, Julie says that after "walking through a world that was black and white", she is beginning to see colour again as she escapes into her creativity in the face of depression.
A Mouthful of Air also stars Zero Hour's Amy Irving, Dexter star Jennifer Carpenter and Billions actor Paul Giamatti, and will be released in US cinemas on October 29. A UK release date is yet to be confirmed.
Seyfried explained earlier this year that she doesn't plan on taking on any blockbuster superhero movie roles any time soon, saying she has "really had to push against it".
Despite saying that "superhero movies are wonderful", she added that she isn't keen on getting involved with one herself.
"I have no interest in being that physical, and being that much of a trip to my imagination every day," she said. "I'm not a fan of green screen. I'm just not."
A Mouthful of Air will be released in US cinemas on October 29, with a UK release date still to be confirmed.
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