The Emergence of Menstrual and Post-Natal Blood

The ninth: The emergence of post-natal blood. If post-natal blood emerges from a woman before sunset, even by one minute, her fast is invalid. If it is after sunset, even by one minute, her fast is valid.
These are the things that break the fast. It is now clear that among the things that break the fast, some are voluntary and some are not. What is voluntary? The first seven that we mentioned are voluntary.

And as for what is not voluntary, it is: Menstruation and post-natal bleeding.