Fishy smelling discharge 20 days after cesarean section, you need to go to the hospital for examination to determine whether there is incomplete uterine regrowth, or part of the placenta-placenta remaining in the uterine cavity, whether there is any infection, etc., and then take targeted treatment. After giving birth, a woman will have a discharge of bad dew, normal bad dew may have a fishy smell, but will not appear to have a clear odor. If there is a fishy odor, it may be caused by incomplete uterine regeneration, or the presence of placenta or fetal membranes in the uterine cavity, or a combination of infections. 1. Incomplete uterine regeneration: If it is determined that the uterine regeneration is incomplete, medication can be used to promote uterine contraction under the guidance of the doctor, such as intravenous injection of uterotonin or intramuscular injection of uterotonin and so on. 2. Retained placenta and fetal membranes: If ultrasound reveals that there is retained placenta and fetal membranes, in order to promote the recovery of the uterus, it is generally recommended that the uterus be cleared as soon as possible, and antibiotics can be used appropriately to control the infection after the cleansing of the uterus. 3. Postpartum infection: If it is determined that the infection is postpartum, two broad-spectrum antibiotics can be used under the guidance of the doctor for treatment, such as metronidazole and levofloxacin. If you use these antibiotics, you need to stop breastfeeding temporarily.