The first thing to consider is breast adduction, the performance of breast adduction is the bilateral extension of the breast to the outside, the middle of the formation of the cleavage is wider, there are two cases. The first, may be congenital development abnormalities, from the beginning of breast development is to the two lateral extension, no obvious discomfort, belong to the congenital genetic no way to improve. The second, acquired factors, such as underwear, sometimes if the cup is too small will cause this situation, such as sleeping posture, if the habit of sleeping on their stomachs will also cause the breast to extend to the sides, of course, there are some other reasons. This latter cause can be slowly improved, such as improving sleeping posture or correcting the type of underwear, most of which can alleviate part of it.