There is no one answer to this question, as the answer may depend on a variety of factors. Some women may have smaller breasts because they are not born with them, while others may have larger breasts because they are breast-fed. Additionally, some women may have more developed nipples than others, which could lead to less development of mammary glands in their breasts. Ultimately, the lack of mammary glands in female swimmers is a mystery that still remains unsolved.
