Breast size is largely determined by genetics, hormones, body fat, and age
Gain overall body weight if appropriate, since breasts contain fatty tissue
Use a well-fitted push-up or padded bra for an immediate larger appearance
Try posture exercises to make the chest look fuller and more lifted
Build the pectoral muscles with chest exercises such as push-ups, chest presses, and dumbbell flyes
Maintain a balanced diet with enough calories, protein, and healthy fats
Avoid unproven breast enlargement pills, creams, and supplements
Consider consulting a doctor about hormonal factors if breast development seems unusual
Ask a board-certified plastic surgeon about breast augmentation or fat transfer if you want a permanent surgical option