RM
“All those examples you are giving is when the life of the mother is threatened ”
Not quite (though depends how you define “life of the mother is threatened )
The yaavetz is in the case of a mamzer (though I dont think this is widely accepted but is used as a snif )
The Tzitz Eliezer 13:102 is about Tay sachs , this is accepted, but not as late as he allows .