No...they're not babies. Did you think so?
you asked: And what is the natural method in which a woman's body disposes unused human eggs?
It is fine to dispose of unused human eggs. It's not fine to dispose of fertilized eggs.
Is a day-old embryo a human baby or not?
There is a difference between and egg, and an embryo that is the result of an egg fertilized by an sperm. Apparently many people on this thread are confused. An egg will never become a baby, unless it is fertilized and an egg is no longer an egg after fertilization, and can never become one again.