Reddish colored discharge one and a half months after delivery may be the onset of menstruation, or it may be caused by abnormal manifestations, such as poor uterine recuperation, intrauterine infection, or residue in the uterus. The reddish bleeding one month after delivery may be a normal menstrual flow, not a discharge. If the discharge is not completely clean and lasts for one and a half months after delivery, you should consider that the discharge is not complete, which may be caused by red bleeding after overwork and poor uterine recuperation after delivery. Inflammation caused by intrauterine infection after delivery can also cause the discharge to remain unclean for one and a half months, manifesting as reddish bleeding. One and a half months after delivery, the placenta and fetal membranes remain in the uterus and cannot be discharged, which will also cause prolonged bleeding, manifesting as reddish colored discharge. It is abnormal for the discharge to remain unclean for a month and a half after delivery, and it is important to go to the hospital in time to check the cause of the bleeding.