The knee is cold after giving birth to a child, probably caused by not paying attention to warmth and cold when sitting in the moon, once the moon disease is very difficult to cure. You can soak your feet in hot water with mugwort after giving birth to a child, then you can apply hot compresses to the knee area for relief, and pay attention to keeping warm in life. You can also choose the way of sweat to relieve the body’s dampness, or you can use oral Chinese medicine to treat it. In life, you should pay attention to keep your knees warm, do not wear shorter skirts and shorts, but also exercise to increase body resistance, appropriate walking, diet should also be regular. If you are planning to have a second child, take care of your knees during the second child’s month and don’t get cold, pay more attention to rest and don’t work too hard, don’t stay up too late, and don’t eat cold food.