There is no more blood on the 42nd day after delivery, and the ultrasound suggests uneven reflux, which may be caused by poor uterine placental surface restoration and retained meconium, which can be treated with medication. 1. Poor uterine regeneration: If there is poor uteroplacental regeneration, it can cause thrombus dislodgement, leading to the reopening of blood sinuses, resulting in uterine bleeding. At this time, you can follow the doctor’s instructions to use drugs to promote uterine contraction, such as mifepristone, to promote uterine contraction, discharge the blood in the body. 2. Retained meconium: If the meconium is not completely detached during labor and remains for a long period of time, which affects uterine regeneration, it may also lead to the situation of uneven reflux indicated by ultrasound. In this case, ultrasound and other examinations should be carried out to determine the cause of the disease, can be prescribed to promote uterine contraction of drugs such as mifepristone for treatment. If the mother has no blood for 42 days after delivery and the ultrasound suggests uneven reflux, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.