The ruling on what is discharged when a fetus is expelled before four months

Question:
If a woman expels the fetus before four months of the pregnancy are complete, what is discharged from her? If the woman is before four months of the pregnancy being complete, is what comes out of her post-natal bleeding or not?

Answer:
After eighty-one days, it is post-natal bleeding, and before eighty-one days, it is corrupt blood. This is because the minimum period in which a person is perfected and his creation is planned is eighty-one days. When he enters the third forty-day period, his creation is gathered in his mother’s womb for forty days as a drop of fluid, then it becomes a clot for the same duration, then it becomes a lump of flesh for the same duration. If he enters the stage of the lump of flesh in the third forty-day period, then if blood is produced from it after its expulsion, it is post-natal bleeding. As for before that, it is corrupt blood that does not prevent prayer or fasting.