If the vaginal discharge has not stopped after delivery, the amount of discharge on the 46th day after delivery is relatively small and the color will be off-white or brown, if the amount is large and bright red, it is considered to be menstruation. If the discharge has stopped for a period of time after delivery, and the vaginal discharge on the 46th day is bright red blood with a large amount, it is considered to be the recurrence of menstruation, which lasts for 3-7 days and then clears up on its own. There are also some women who have poor uterine recovery due to tiredness, poor rest, lack of hygiene, etc. The discharge is intermittent and incomplete, sometimes red in color, so it is difficult to determine whether it is menstruation or discharge. It is recommended to go to the hospital for a follow-up examination on the 42nd day after delivery, and perform ultrasound of the uterine adnexa and other related examinations to see if there is any tissue left in the uterine cavity, so as to clarify the situation.