How are they minors? They're married working adults.
If you're saying they're too young to have kids, as responsible adults, they could also just opt for birth control you know.
I know, I know, applying logic to a shounen manga. Silly me.
@beperov some people have sex during that age and they're not even married. I don't get why that's dangerous. Besides, they're already married, so any of that stuff is safe.
@beperov is he really though? He is still a kid physically but no way in hell is he the same mentally. I mean he has a job, is very responsible, smart and can support both himself and his wife. He even managed to get his house rebuilt. So I don't think having a child is gonna be a problem.