The most significant factor determining breast size and development is genetics.
Here's a breakdown of the potential reasons your chest might not be developing in a way you consider "female":
- Genetics: According to research, genetics plays the most crucial role. If there is a family history of smaller breasts, you may also have smaller breasts. Your genes also determine your hormone levels, another factor in breast size.
Therefore, the primary reason for a lack of breast growth is likely due to your genetic predisposition. If other women in your family tend to have smaller breasts, it's likely you will as well. This includes genes that influence hormone levels which also are a factor in breast size.
