The Apostle of Allah (peace_be_upon_him) said: There are three (persons) whose actions are not recorded: a sleeper till he awakes, an idiot till he is restored to reason, and a boy till he reaches…

The Apostle of Allah (peace_be_upon_him) said: There are three (persons) whose actions are not recorded: a sleeper till he awakes, an idiot till he is restored to reason, and a boy till he reaches puberty.
Source: HOTD