After the birth of a child, estrogen changes in the body, which is the reason for the body to gain weight and secrete milk, but there is also a possibility that sodium and water are stored, depending on whether the legs, especially the back of the feet, can be pressed out of the depression, there is a depression to prove that there may be edema in both lower extremities, at this time, the legs should be elevated, hot compresses to promote venous return. It is also likely that the edema is caused by compression of the veins leading to the lower extremities or the veins that transmit from the lower extremities to the heart, due to sedentary or pregnancy-related compression. It is recommended to measure blood pressure to check whether it is estrogen or blood pressure fluctuations that cause edema in the lower extremities. The most likely reason for the feet to become larger after childbirth is edema in the legs, in addition to the increase in body weight.