I think it's meant to be like Connie and Stevens kid. That stuff is floating around the internet and I'm not a huge fan of it because it doesn't make any sense
Well Steven doesn't really age, and if he did have a kid I would assume that as soon as the child is conceived, Steven would dissapear/die. And if he doesn't grow I feel like it would be a little weird
He is half-human, so I think he'd just lose his gem and powers.