patreon bans incest and this is an incest game.
and no, it is not a serious issue. it is made up characters that are depicted with made up pictures. i am far more disgusted by the thought of incest than by a newborn being present. real life parents do that a lot, just google it.
gratulations, you successfully promoted the game. i had a look. i fast forwarded to that scene. and no, the baby viewing and reacting to the deed is not the sexual focus. compare to any cuck or voyeur scene. you do see a camera view that is positioned where the baby is. but you do not see the baby reacting to that scene. for all you know the baby could be looking at her own toes or be fallen asleep.
if the baby does look, she would be distracted by the hand of the guy, that he dangled right in front of her. you might have missed the hand, because of the background action and the dirty talk, that you, as a non-infant, could comprehend.