the game would be banned if you could
isn't the new modern warfare gonna let you play as a kid who can get shot and even let you shoot a kid at one point?
List of games where you can kill children that I know of.
Fallout - Rated M.
Fallout 2 - Rated M.
Fallout 3 (blowing up Megaton with 2 kids inside) - Rated M.
Fallout removed the feature, Fallout 2 faced controversy and Fallout 3 isn't directly shooting a kid which would obviously cause more controversy.