Pregnant women can wear bras during pregnancy, but they need to wear looser, cotton bras, not bras that are too small. After pregnancy, the secretion of estrogen and progesterone in the body will cause the breasts to grow gradually. If you wear a bra that is too small, it is easy to squeeze the breasts, which will affect the blood circulation of the breasts and lead to poor blood circulation in the breast tissue, causing painful symptoms in the breast nodules and seriously adversely affecting breastfeeding after delivery. During pregnancy, you need to remove your bra at night to avoid affecting the blood circulation of your breasts, and in the later stages of pregnancy, because the breasts and nipples are growing more obviously, try not to wear a bra again, and pregnant women need to wash their nipples with warm water every day to stimulate them more. If you have sunken nipples, you need to use your hands to pull the nipples outward when you wash them every day to avoid sunken nipples affecting the baby’s sucking after delivery.