To do its job, your bra needs to be the right size and shape. When your size or shape changes, you need a new bra. In addition to obvious reasons (puberty, pregnancy, breastfeeding, weight gain/loss, surgeries), size and shape changes can happen with birth control, menopause, or sometimes for no reason at all. Don’t put off buying a new well-fitting bra – your body deserves comfort at any stage.