Stewie Griffin

Despite being a year old, he is a child prodigy with a sophisticated psyche and speaks perfect with a slightly English accent. Despite his intellect, he behaves like any child his age: he likes The Teletubbies, when Peter plays with him to the game of "Peek a Boo" is thought to have disappeared suddenly, he talks to his teddy bear Rupert as if he were a living being, enjoys the bugs that his mother does in his stomach and has no idea of how to use the toilet.