The fictional animated character of Stewie Griffin is a one year old. He has an intellect well above his years, and was once obsessed with killing his mother and world domination. Reference: http://www.ask.com/wiki/Stewie_Griffin.
Stewie Griffin, the popular character from the show "Family Guy" has not been refered to as being older than 1. He is supposed to be a prodigy that can speak fluent English although he goes to preschool.