Child

Children are the young inhabitants of the wastes. In Fallout 3, a child is a human character under the age of 16.

Differences between the games
Children are killable in the first two Fallout games. If you kill them you get the ChildKiller Reputation.

Children in Fallout 3 are not killable. Bethesda faced a similar problem when making The Elder Scrolls IV: Oblivion, as they considered adding children to make the game more realistic, but this was controversial -- if the children could be killed, Bethesda could be accused of making a child murder simulation. Bethesda's response was to simply make the characters invincible. This once again raised issues, because the tactic would undermine the whole point of children being there, which was making the game more realistic. Eventually Bethesda scrapped the idea for The Elder Scrolls IV:Oblivion, but in Fallout 3 they have gone the other way, allowing children for realism, but making them invincible.