Breast swelling and pain in the first month of pregnancy is due to the influence of hormone level after pregnancy, breast enlargement and breast duct enlargement, there will be some slight swelling and pain. You can gently massage your breasts and clean your nipples in the shower. You should not wear tight bras, but preferably wear cotton bras for pregnant women. If you don’t change your bra in time, the blood circulation of your breasts will be affected and the mammary glands will be squeezed and inflammation of the mammary glands may occur. Pregnancy replacement bras are not just ordinary bras that are bigger, it is best to have special products. During pregnancy, the breasts become bigger and the lower part of the breast expands to both sides, which is not satisfied by ordinary bras. So the straps of the bra should be wide so as not to increase the pressure on the shoulders, and the fabric should preferably be soft cotton material that absorbs sweat and is breathable, and should not be padded so as not to affect the breathability. Bra support should be good enough to avoid sagging or deformation of the chest, to buy 2-3 at a time to facilitate changing.