Since you answered the question about how astrid would feel about not having kids, how do you think hiccup would react?
The question about Astrid being barren and how she would handle it? Hiccup would, of course, handle it much better than she--and it's not because the "problem" wasn't him, it's because, as I've stated before, I don't think he's really yearning to be a father. The same way he's not yearning to be a chief. Yeah, he knows it's something that's going to happen but it's not a real personal goal for him. He's happy with just Astrid.
Hiccup also doesn't take slights to tradition and blows to pride as painful as Astrid. And he knows this about her, so he worries for her. The lack of children--his own or not--doesn't bother him. Astrid handling her inability to conceive does.
Of course, Hiccup's chief and a viking so he has to have kids somewhere. They'd adopt most likely. Less likely have a surrogate. That doesn't matter to him half as much as making sure Astrid's okay.















