When a birth mother treats her son's head swelling, blood may stream from the top of his head down to his neck, creating a harsh-looking scene. Yet, onlookers perceive this as an act of solicitude—a mother's desperate attempt to cure her child quickly, driven by deep love.
If a stepmother performed the same act, people would likely condemn her as cruel and heartless. They might even assume that all stepmothers secretly wish for the demise of their husband's children from a previous marriage.