Several films on breastfeeding topics are, or will soon, be out:
One, called Formula Fed America, is directed by Leslie Ott, a mother who struggled with breastfeeding and wanted to explore our culture's attitudes toward breast and formula feeding. You can see a trailer on the film website.
Another, called Mother's Milk, is an 11 minute film about a mother who loses a baby and discovers breastmilk donation. You can read more about it here.
The third, already out, is an award-winning Peruvian film called The Milk of Sorrow. It's described as a film about "a legacy of violence and oppression passed down through breastmilk." Please be warned that the story concerns violence against women in Peru's recent past.

