Rattling of bones during pregnancy is usually to be considered as lack of nutrition and weight gain. After conception, the fetus continues to grow in the body and the body requires a large increase in nutrition. When there is a lack of calcium in the body, it can lead to rattling of bones and cramps in the legs and feet. It cannot be satisfied from food, and after three or four months of pregnancy, it is necessary to take calcium supplements in time and get more sunshine to promote the absorption of calcium. In the middle and late stages of pregnancy, the growth rate of the fetus is accelerated, and the weight is increasing, which is likely to cause inconvenience in movement, and the amplitude is increased at this time, which will also cause the bones to ring. This is a physiological phenomenon, does not cause obvious physical discomfort, is not in need of treatment, after giving birth to the baby, can be a natural recovery.