The amount of postpartum malodorous dew is about 250-500ml, and it usually takes 4-6 weeks to be clean, without odor, but with a bloody smell. The specific color changes are as follows: a. Bloody nightmare: bright red, due to the presence of large amounts of blood, lasting about 3-4 days, with a large number of red blood cells, meconium and fetal membranes visible under the microscope. Plasma malodex: light red, due to the presence of a large amount of plasma, lasting about 10 days, visible under the microscope as uterine exudate, cervical mucus, meconium tissue, red blood cells, white blood cells, bacteria, etc. White malodorous fluid: white in color, due to the presence of a large number of white blood cells, lasting about 3 weeks, with more white blood cells visible under the microscope, as well as meconium, epidermal cells, bacteria, etc.