The enlargement of breasts during pregnancy is due to the influence of hormonal secretion in the body. After pregnancy, the estrogen and progesterone in the body will increase and the milk ducts will expand, leading to milk secretion and breast enlargement, and during this period, the areola will be colored and enlarged, and the nipples will also be enlarged and colored, accompanied by breast swelling or tingling, which are normal. This situation is in preparation for the birth of the baby, which will have sufficient milk production. Try to pay attention to hygiene and cleaning during this period. If there is nipple inversion, you can gently pull the nipple. Usually you should try to pay attention, do not eat spicy and stimulating food, and wear loose cotton underwear, which can reduce the pressure on the breast and promote blood circulation to the breast.