In the early stage of pregnancy, the nipple will harden under stimulation, clinically known as the phenomenon of erection, mainly in the role of estrogen nipple is more sensitive to this phenomenon, is a normal physiological phenomenon, do not be nervous. After pregnancy, due to the role of estrogen, will make the nipple and areola coloring phenomenon, the phenomenon of breast enlargement, and with the hand touching the breast, the feeling will be very soft, these are the normal reaction caused by pregnancy. Clinically, it is recommended to take good care of the breasts during pregnancy. If the nipple is mildly inverted, it is recommended to gently pull the nipple after applying hot compresses every day, which can correct the mild inversion of the nipple and is conducive to breastfeeding after the birth of the newborn.