The judgment method of breast sagging is below 45 degrees parallel to the chest for sagging, and the judgment method of breast expansion is the angle between two breasts is greater than 150 degrees for expansion. 1. Breast sagging: there are congenital and acquired breast sagging, congenital refers to the state of breast sagging when the breasts develop and mature, which is related to the individual’s physique. Acquired ptosis generally occurs after the end of breastfeeding, due to the degradation of breast tissue, elasticity decreases, which leads to ptosis, the general detection method in the chest parallel to 45 degrees below. 2. Breast enlargement: Breast enlargement is a kind of chest deformity. It means that the distance between the two breasts is large. Congenital breast enlargement generally has no way to solve, acquired breast enlargement, considered to be caused by the long-term wearing of underwear incorrectly, can be adjusted through the underwear, the breasts will be gathered together. It is also possible to solve the shape problem, if, the angle between the two breasts is greater than 150 degrees for the expansion. Sagging breasts or breast enlargement may affect the beauty of the breasts, and can be improved by wearing adjustable underwear, developing a good sleeping posture, and performing chest exercises to improve sagging or enlargement.