The cause of this symptom is the lack of calcium supplements during pregnancy and after childbirth, resulting in serious loss of bone calcium in the mother’s body and causing arthrosis. The joint may be maladaptive due to the lack of physical exercise for a long time during pregnancy and the sudden movement of the joints after delivery. In this case, on the one hand, we should pay attention to take appropriate calcium tablets to supplement calcium, such as Calcium D, 1 tablet/day taken orally. Eat more food with high calcium content, such as milk, tofu, nuts, shrimp. Get sunlight properly. On the other hand, pay attention to postpartum exercise, should be gradual, first some light strength, short time, small amplitude exercise, and then increase the intensity, amplitude and time of exercise after the body gradually adapt.