Talking of Klingon kids maturing faster, does this mean that B'Elanna Torres would've grown up quicker? I wonder how old she was when she first joined Voyager?
Given she was born in 2349 she would be 21-22 in Earth years. Interestingly when she was 12 she looked twelve and not 20, so she aged in a more normal "human" way. Maybe a that's a sign that female and male Klingons mature significantly differently, though Alex was more Klingon than Torres so it might be a genes issue with her.
Sidenote: I don't think DS9 ruined Alex.