There's no single "normal" breast size for girls. Breast size varies greatly depending on genetics, age, body type, and ethnicity. What is considered average or typical in one population may differ significantly in another.
Average Breast Sizes Around the World
Data on average breast size varies depending on the region and the methodology used. However, some studies show these averages:
- USA: Studies indicate an average bra size of around 34DD. [Source: AnaOno] However, this is an average, not a definition of "normal."
- Other Countries: Average breast sizes differ significantly across countries. For example, in Brazil and Canada, the average is closer to a C cup, while in China, it's closer to an A cup. [Source: AnaOno]
Factors Influencing Breast Size
Several factors contribute to breast size variation:
- Genetics: Family history significantly influences breast size and shape.
- Age: Breast development occurs during puberty and continues to change throughout a woman's life, including during pregnancy and aging.
- Body Mass Index (BMI): BMI can influence breast size; higher BMI often correlates with larger breast size. [Source: JPrasurg study on breast dimensions in obese women]
- Ethnicity: Average breast sizes vary across different ethnic groups.
What is Considered "Normal"?
It's crucial to understand that "normal" is a subjective term. Healthy breast development varies widely, and there's no single "ideal" or "normal" size. Any size within the range of healthy development is considered normal. Having breasts of slightly different sizes is also common and perfectly normal. [Source: Nemours KidsHealth]
Having smaller or larger breasts than the average is entirely normal. What matters most is overall health and well-being. Any concerns about breast development should be discussed with a healthcare professional.
