Heredity, (the way certain features such as eye color are passed down from generation to generation), is the most important factor in determining what the size and shape of your breasts will be. In general, young women have different breast sizes because of differences in families, hormones, and weight. There are no magic creams, special exercises, or clothing that will permanently change the size of your breasts. If your breasts have not started to develop, you may have a hormone imbalance. It’s a good idea to make an appointment with your health care provider to get checked.
Our health guides are developed through a systematic, rigorous process to ensure accuracy, reliability, and trustworthiness. Written and reviewed by experienced healthcare clinicians from Boston Children's Hospital, a Harvard Medical School teaching hospital and consistently ranked as a top hospital by Newsweek and U.S. News & World Report, these guides combine clinical expertise, specialized knowledge, and evidence-based medicine. We also incorporate research and best practices from authoritative sources such as the CDC, NIH, PubMed, top medical journals, and UpToDate.com. Clinical specialists and subject matter experts review and edit each guide, reinforcing our commitment to high-quality, factual, scientifically accurate health information for young people.