Hi,Thanks for posting your question. I am happy to try and help you. It is important to remember that a board certified plastic surgeon will be your best resource when it comes to an accurate assessment of your situation, and concerns. Having said that, breast development can occur at different rates on different women. As you are maturing your percentage of body fat will change. As you become thinner, your breast will get smaller. Now this is the bad part, if you gain weight, your breast may not get larger. They may become larger but they may also not change, but the rest of you may get bigger. Also, birth control pills will influence your breast sizes.I hope you found this helpful. Have a great day.