Of course, they can! However, choosing maternity brassieres with an underwire can be tricky. They are suitable to wear before your baby arrives. However, after birth, ones without an underwire are most preferred. Regular nursing bras have a flap over the breast to make feeding the child easy. An underwire, in this case, makes it difficult to open and close the flap. It can also be hazardous for the baby due to its thin, sharp structure. Therefore, it is best to avoid bras with underwires before your little one arrives. Alternatively, you can go for one that can be used with or without the wire.