It is completely normal to notice a decrease in breast size or fullness about a year postpartum. During pregnancy and breastfeeding, hormonal changes expand breast tissue; once breastfeeding stops and hormones stabilise, this tissue naturally shrinks. There are no safe medicines or pills to restore breast size, and hormonal therapies are not recommended for cosmetic purposes due to potential risks. To naturally improve firmness, you can focus on chest-strengthening exercises (like push-ups) to tone the underlying pectoral muscles, maintain a balanced diet, and wear a supportive bra. If you are considering surgical options, it is best to wait until you have finished having children.