Having different-sized breasts is perfectly normal. It's quite common for girls to have different-sized breasts or nipples, especially as they develop during puberty. Everyone's different, and no two women's breasts will look exactly the same. In fact, asymmetry - where one body part, like a foot or a hand, is a slightly different size or shape from its partner — is quite common in humans. When girls begin puberty, usually between the ages of 8 and 13, their breasts begin to develop starting with just a little swelling under the nipple. This is known as breast budding. You may notice that one of your breasts starts developing before the other or that one is growing more quickly. Many times this difference in breast size evens out once a girl is older, usually by age 20. But it's also perfectly normal for women's breasts to remain different sizes even when they're fully developed. Some girls with different-sized breasts worry that there's something medically wrong, but chances are, for a teen, there isn't. If you're really worried about your breast size, talk to your doctor or gynecologist. He or she should be able to reassure you that your breasts are normal. Girls who notice their breasts are different sizes are aware of their breasts — and that's good news. Being aware of your breasts can help you stay healthy! Learning how your breasts normally look (and feel) can help you notice any changes that might not be normal. Your doctor can teach you how to do a breast self-exam (BSE) that will help you become familiar with your breasts so you can identify any changes. Some girls worry about their different-sized breasts for cosmetic reasons. Many girls with different-sized breasts or nipples just accept that they are normal and don't do anything differently. But other girls feel self-conscious. It's likely that no one else notices your breasts look different, though. Other people usually can't see the difference in the size of a girl's breasts — even if that difference is a full cup size. The fact is that exercises, supplements, or diets won't change the size or shape of a girl's breasts — only plastic surgery can do that. (And most doctors recommend that a girl wait until her breasts have finished growing before considering plastic surgery.) Some girls decide to wear especially supportive bras or special inserts that make their breasts appear more equal in size. Talk to a lingerie salesperson if you want some suggestions for evening things out. It may also help to talk to your mom, older sister, or an aunt or grandmother — they may have worried about having different-sized breasts during their teen years, too. Everyone develops differently, and it's normal for the two sides of our bodies to be a little different from each other. We humans aren't as evenly proportioned as we appear at first glance! Can I make my breasts larger? Although many products (from special creams to exercise techniques) claim to boost breast size, you should save your money: They don't work. The truth is that the only way to permanently change breast size is cosmetic surgery. Most doctors won't perform breast enlargement surgery until a girl reaches 18 because the body takes time to develop and some girls develop (and have changes in the size of their breasts) later than others. Even after 18 there are certain physical and psychological risks involved with breast implants. Everyone goes through times when they don't like parts of their bodies. These feelings are part of normal development and the process of adjusting to our changing bodies. Even girls with large breasts can be unhappy about them. Some find that their backs or shoulders hurt or that the large breasts attract unwanted attention and they may wish their breasts were smaller. If you're unhappy with the size or development of your breasts, talk to your doctor or gynecologist, who can probably reassure you that you're developing normally. It’s an exciting time when your breasts finally start growing. And often an anxious time, with lots of worries… like how big will they get, will they look good, and is anything wrong with mine? So here is the basic information you need to know about healthy breasts. The development of tender breast “buds” is usually the first sign of puberty in girls. Some girls notice breast growth as early as age 7 or 8, while others don’t start until age 13 or so. The timing is determined by your own biologic “clock” that tells your body to start producing high levels of female hormones. Breasts go through five “stages” of growth over the next five to six years, until their full maturity is reached by age 17 or 18. The final size of a girl’s breasts is determined by heredity and can range from very small (like bra size AA) to very full (such as size EE). Breast size varies greatly among women, and all sizes and shapes are normal and healthy. The breast made up of milk glands and ducts, connective tissue and fat. In teenagers and young women the breast tissue is firm and dense, and then becomes softer and more fatty with age. There is no muscle tissue in the breast, which is why there are no exercises to make them bigger. However, the pectoral muscles that lie underneath the breasts can be firmed up to provide lift and shape (think of the “pecs” on male body builders.) Since the breasts do contain lots of fat cells, women will notice their bra size increases with weight gain. Nature designed a woman’s breast to produce milk for her baby. In our society however, the breast is often viewed as a symbol of femininity and sexual attractiveness, so it is normal for a young woman to have lots of questions about her breasts.