Before a woman’s menstruation, some of them will have breast swelling and breast enlargement are related, and many of them are unresponsive. During early pregnancy, breast changes are more obvious, after pregnancy by hormone levels, breasts will continue to increase in size, further development of breast tissue, and the breast skin color will become darker, nipple hardening, areola range, color will deepen, some pregnant women in the nipple around the nipple will grow a Montgomery’s nodule, are for the late breastfeeding to prepare. Breast changes that occur during menstruation will return as soon as menstruation passes, while breast changes that occur during early pregnancy are present throughout the pregnancy.