After giving birth, estrogen will change in the body, which is the reason for the body to gain weight and secrete milk, but there is also a possible reason for water and sodium retention. At this time, 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 larger feet after childbirth is edema in the legs, in addition to the increase in body weight.