Bio-medical ethics

Compare and contrast those positions sending attachment.  For bio-medical ethics.
A.) Jane and Bill are a deaf couple and they want a deaf child, so
Jane takes a drug while pregnant that will make the child deaf,
without hurting it in any other way
b) Mary and Bob are a deaf couple and they want a deaf child, so
they go to a fertility clinic, fertilize several of Marys eggs, and
implant the one that has the gene for deafness

What are the moral differences between these cases, if any. Do you approve of one, but not the other? Both? Neither? Who is being hurt
in each case?