Stewie Griffin is a one year old prodigy who has a very sophisticated psyche,is able to speak fluently,and is intended to have a slightly camp upper class English accent.Stewie succumbs to other weaknesses of children his age-he believes Peter has truly disappeared in a game of peekaboo,talks to his teddy bear Rupert as if he was alive,is overcome with laughter when Lois blows on his stomach,and has no idea how to use the toilet.Stewie lives with 5 relatives his dad Peter,His mum Lois,His older brother Chris,His sister Meg and his dog Brian.The one thing that Stewie hates eating is Broccoli and he eventually kills is Mother Lois in the season 6 episode "Stewie kills Lois".The voice of Stewie is a man called Seth MacFarelane who also the voice of Peter and Brian

here we have Stewie Griffin on wheels of his favorite tricycle

stewie griffin

Looks like stewie is mad at you

stewie griffin

Stewie sucks on his thumb when he is asleep

stewie griffin

Run Little Griffin Run

stewie griffin

The Mothership has landed start the fraken show

stewie griffin

Stewie Griffin is ready to kill

stewie griffin

References:

Stewie Griffin image borrowed from:- http://familyguy.wikia.com/wiki/Stewie-Griffin