::, do you have any proof that "Opponents of the technique are trying to popularize the term 'three-parent baby' because they believe it has more negative connotations."? And stating that "They would presumably like to rename the extra-marital sex article to bastard child" makes no sense since those two topics are not the same thing. With this edit, I see that  renamed the article to Mitochondrial donation. The three policies to keep in mind when naming this article is WP:Common name, WP:POVTITLE and WP:Precise. And the one guideline to keep in mind when naming this article is Wikipedia:Manual of Style/Medicine-related articles#Article titles. I might ask WP:Med to weigh in on this matter.