1-Menstruation, for Allah (G. B. H) says: {So keep away from women in their courses, and do not approach them until they are pure, then when they have purified themselves you may approach them} [Al-Baqarah: 222] (pa: 62)

Also, Aisha (G. p. H) narrated that: "Fatimah bint Abu Hubaish said to the Prophet (P. B. U. H) Messenger of Allah, I do not become pure (from bleeding)... '

The Prophet (P. B. U. H) said:

"When the real menses begins give up your prayers and when it (the period) finishes wash the blood off and pray".

[Al-Bukhari, Vol. 1, The Book of Menses, Chapter 8/300]

2- Postnatal blood, which is the bleeding that occurs after giving birth.

It has been mentioned in the book Nail Al-Autar that:

"The Scholars have agreed upon the fact that postnatal blood is like menstruation with regards to what is permissible, forbidden, recommended, and makrooh".

Al-Shafi'i said: "The menstruant woman should make ghusl when she is pure (free from blood) and the postnatal woman should make ghusl when her bleeding stops".

3- Giving birth, even to a blood clot [The fertilized egg becomes a blood clot after 40 days from fertilization] or a lump of flesh (an embryo [The blood clot becomes an embryo after 40 days from being formed, i. e. after 80 days from fertilization] ) and even if the birth is a cesarean.

That is if she does not bleed after giving birth, otherwise the ghusl from postnatal blood is sufficient.