One month after giving birth to a child, there is still blood may be caused by the following reasons: first, the uterus is not good, due to the body is relatively weak, the postpartum does not have a good rest, poor sleep or not to strengthen the nutritional cause of the body can not quickly recover, so the uterus can not be quickly repaired, there will be vaginal bleeding, it is recommended that this case as soon as possible to take some drugs to promote uterine contraction of the given treatment; the second, because of Secondly, because of infection, if the infection caused by the uterine cavity, then there will be irregular vaginal bleeding, so it is recommended to go to the hospital for timely examination to rule out inflammation, and if there is inflammation actively give anti-inflammatory treatment; thirdly, because of intrauterine residual tissues, such as placenta residual fetal membranes caused by the residual bleeding, it is recommended to ultrasound to learn the situation of the uterus, and according to the specific circumstances of the treatment given. The third is because of residual tissue in the uterus, such as residual placenta and membranes.