Is the night of birth counted among the days of nifas (postnatal bleeding), and does purity occur after forty days, by night or by day?

The ruling concerning post-natal bleeding (nifas (definition)) pertains to the blood discharged due to childbirth. If the bleeding stops completely before forty days, then the woman in post-natal bleeding has become pure. However, if the bleeding continues, she should wait until the end of the forty days from the moment of childbirth, whether it occurs at night or during the day. The duration of nifas is calculated starting from the moment of birth.