So, do children still get born with birth defects? If so, I think this would be seen as a very bad sign of punishment from the gods, like the most extreme cases in our own world. It would split couples apart with mutual accusations, or the whole family might be sent into exile. If not, it makes it even more utopian of a setting. Which isn't a bad thing, as long as there's an outside threat. Far more fiction goes too far the other way, where I don't care if the "heroes" win or lose, because the world they're fighting for is arguably better off dead.