Is it obligatory to inform a suitor about small breast size before the marriage contract, to avoid his aversion after marriage?

The defects that a woman proposing marriage must disclose are those that would validate the annulment of the marriage, such as defects that prevent intercourse, or contagious diseases like leprosy. Some scholars, like Ibn al-Qayyim, have broadened this, considering every defect that repels the other spouse as falling under these categories of defects.

Therefore, if your defect is one that causes repulsion, you must disclose it; otherwise, you are not obliged to. The disclosure should be made through your guardian, or one of his female relatives, or via email, limited strictly to what is necessary.