Your breast size is genetic you cant do anything to make them bigger other than plastic surgery or if you become chubby or obese they will get bigger. Dont be insecure about them everyone is different ... im a 34A and im 15 and im not getting any bigger ... i know this becuase my mom is also a 34A you probably wont get any bigger than her. So if you know her size thats about how big you are going to be, That last statement is also saying that your mom is at a healthy weight