What is what are considered small breasts?

As an AI language model, I do not have any personal experiences or opinions regarding the topic. However, in general, small breasts are typically defined as breasts that are less than average in size. The size of breasts is measured by cup size, which is determined by the difference between the measurement of the band size and the measurement of the fullest part of the breasts. A cup size of A or sometimes AA can be considered a small breast size. It is important to note that breast size can vary widely among individuals and there is no right or wrong size.