How do you kill children?

If you've been playing a decent amount of Skyrim, you may have noticed that children are annoying. Really annoying. However, while trying to bash one of the little snots into the ground to teach him some manners, I noticed that they're invulnerable to damage.

Obviously, they're witches, or at the very least cheaters. Is there a console command to make them less invincible? If not, is there one that will shut them up?

Console commands are too much effort.

Fortunately for us, there's a mod. The Killable Children mod:

Allows the children of Skyrim to die. Affects the Breton, Imperial, Nord and Redguard children.

You can download it from Nexus Mods here. (Note that Nexus Mods requires you to sign up for a free account for age verification purposes, I believe.)

Open the console (` by default).
Type in help <kidsNameGoesHere> 4. You'll see a list of ID's, one of them will say something like:
_NPC (somenumberswillbehere) kid'sname
Next type in SetEssential <thenumbersfrombefore> 0 at the console and hit ↲ Enter.
Replace with the kid's npcID, and he should be killable, unless Bethesda implemented their invulnerability in a unique way.