If blood returns to a woman in postpartum bleeding after forty days, is it postpartum bleeding?

Question : Or in the evening, and she became pure within, for example, twenty days, and then the blood returned to her. As for this blood, the scholars said: if it occurs during a period of doubt, meaning within forty days or after forty days?

Answer : After forty days, they say that if it coincides with her usual period, it is menstruation, and if it does not coincide with her usual period, it is not menstruation. However, the stronger opinion in this issue is that if the blood returns to her, it is postpartum bleeding, because it is the custom for a woman to become pure. This is if the period of purity was one or two days. But if she was pure for many days and then the blood returned to her, it is menstruation.