Taking frequent showers can help to prevent painful heat rashes from developing. If a heat rash does appear, the mother should keep the area clean, dry, and exposed to air as much as possible. Cotton nursing bras allow air to circulate better than synthetic fabrics and are especially comfortable for large-breasted mothers. Wearing cotton nursing bras also helps prevent heat rashes. If a mother can locate these sizes, the fabrics are almost always synthetic and less comfortable to wear.
Most large bras have seams in the cups.
If the bra does not fit properly, the pressure of the breast against the seam can constrict milk-making tissue and contribute to plugged ducts or a breast infection. Some large department stores carry larger nursing bras in their maternity departments, but they usually have to be special ordered. Most other sources of large nursing bras also need to be mail ordered. Consequently, large-breasted women may want to order nursing bras in the last weeks of pregnancy to ensure that they will have them in time for breastfeeding. Bras purchased during the last weeks of pregnancy should have extra room both in the cup and around the rib cage.