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What sounds more likely, for the show to say to the viewer "Yes, they had sex and Cadence became pregnant then gave birth to a child." or for them to handle it in the nebulous way that they did by her simply just by saying she was going to have a child (without showing that she was pregnant physically- just by saying it) and then having a child offscreen later on? They don't need to imply that they had sex specifically, just that they had a child because- once again- this is a children's show rated for children and not for mature audiences. the mature elements of it are not even implied because of the show's rating. Adults can put two and two together because we know sex makes babies, but it's not one of the show's talking points. It's a show about colorful ponies making friends, not colorful ponies having sex and fretting over their orientation.
Read above. One thing implicates another to adults, but not to children. Did they highlight the straightness of their relationship in the show or did they just marry them? Did they go into specifics about how children are made or did Cadence just have a child as a background story function?
Correct answer: the latter, on both questions. If this show were rated anything above TV-Y then you might have an argument. Adult themes do not suit that rating therefor mature concepts do not apply.