It is normal to still have malodorous fluid 20 days after the cesarean section. This is because the duration of postpartum nightmare is 4-6 weeks, which is about 1 month. Generally, the nightmare starts with bloody nightmare, which is basically 3-5 days of bloody nightmare, from bright red to light red after the cesarean section. Then comes the plasma nightmare, which lasts for about 2 weeks and is basically light pink or lighter in color. Finally, when you are almost out of the month, you will have white nightmare, which also lasts about 2 weeks. So, the total amount of nightmare is about 400-500ml in 4-6 weeks. After 20 days of cesarean section, it is normal to still have bad milk and it is necessary to observe the color. If there is still fresh blood 20 days after the cesarean section, or if the amount is high, you need to go for a check-up to see if the uterus is not recovering well and there is a collection of blood in the uterine cavity that needs further treatment. If the color is light pink or yellow malaria, you should not worry about it, it should be normal.