Chapter on the Rules of Menstruation, Istihadah, and Nifas, and Purification From Them

It is also narrated from Ahmad ibn Muhammad, from Al-Husayn ibn Sa’id, from Al-Qasim ibn Muhammad, from Muhammad ibn Yahya Al-Khath’ami, who said: I asked Abu Abdullah عليه السلام about the duration of nifas (postnatal bleeding). Imam عليه السلام said: "It is same as her previous births and based on her past experiences." I asked: "What if she has not given birth before?" Imam عليه السلام said: "Between forty and fifty days."