What factors determine the shape of breasts?

There are several factors that contribute to the shape of breasts, including genetics, hormonal influences, and age-related changes. Genetics play a significant role in determining the overall contour and appearance of breasts, as family traits and inherited characteristics can influence breast shape. Hormonal influences, such as those during puberty, pregnancy, and menopause, can also impact breast size and shape. Additionally, factors like weight fluctuations, pregnancy, breastfeeding, and the natural aging process can cause changes in breast shape over time.