the women having bleeding after delivery (post-natal or puerperal blood) would refrain (from prayer) for forty days.
Narrated Umm Salama (radiy-Allahu ‘anha) : During the time of the Prophet (salla-Llaahu ‘alayhi wa-sallam) the women having bleeding after delivery (post-natal or puerperal blood) would refrain (from prayer) for forty days. (Reported by Al-Khamsa except An-Nasa’i. The wording is that of Abu Da’ud)
And in another narration of Abu Da’ud it has: “The Prophet did not command her to make up for the prayers (abandoned) during the period of bleeding.” Al-Hakim graded it Sahih (authentic)
1.. It means the maximum period of post-natal blood is forty days, while the minimum time for it is not fixed. If it continues more than forty days, it will be regarded as Istihada (bleeding between periods) which is not a hindrance for prayer, fasting and having sexual intercourse. The commands and prohibitions related to post-natal bleeding are the same as those related to menstruation.