I don't like the idea of children but I guess as long as you can do to them what were not aloud to talk about then it will be ok but if they're invincible or just become unconscious when they're health gets to low then I will go trade Skyrim in at gamestop for some used games. I play on XBOX 360 so I cannot mod it either.
Then I suggest you save yourself the time, money, and effort, and simply not get the game in the first place. Bethesda is not going to allow killable children in the game.
And to repeat, discussing killing children is not a topic for discussion on these forums. Since someone in every single thread that mentions children brings up killing them, these threads end up locked.