Generally speaking, the size of the foot will not change after a person becomes an adult, but if there is edema in the lower limbs caused by obesity or kidney disease, etc., the foot may become smaller after losing weight. Generally speaking, the size of the foot is fixed after a person’s body reaches adulthood, which is affected by the development of the body and will be finalized after the skeleton matures. In addition, the bones generally do not shrink, so the feet will not become smaller. However, in the following cases, the feet may become smaller, such as obese people have more fat on the feet, generally after losing weight, the fat may be gradually reduced, and the feet may become smaller. If a person has kidney disease, or a woman is pregnant, causing lower limb edema, foot swelling, generally after treatment or normal delivery, the foot will gradually become smaller and return to its original state.