Baby Blood (1989)

"Baby Blood" is a fascinating French film from 1989 that is about an ancient alien life form that needs to be developed and born from a human in order to continue forward in its evolution. It finds the perfect host in a woman named Bianca who would at a circus. After the alien becomes impreganted in her, she leaves the circus for the city. Her lover comes to bring her back but she murders him at the alien's command. The alien needs blood in order to grow. She refuses this time but soon gives into its demands as it threatens her life. As the alien grows within, her methods of killing become more blatant and disconnected from her humanity. She eventually gives birth to what looks like a normal human baby, but this is just a shell of the monster within. The movie ends with the alien slipping into the sea to evolve once again.

Favorite moment - When Bianca is working as a taxi driver, picking up a fare and when she sees a jogger, she runs him into a wall and then kills the passenger. Has to feed the baby!