somehow i have doubts that what you say happens in such a way that the sexual focus is about the newborn seeing the deed.
i would assume patreon has some of their dubious guidelines about minors being in the same room or some such. but patreon also prohibits relations between step siblings and that is an incest game and also abandoned for two years now.
so i would say, if the newborn was not part of the act and the guy just made some stupid noises to calm the baby and dirty talk the mother, it would not qualify for anything.