Stewart Gilligan "Stewie '' Griffin (voiced by Seth MacFarlane) is the Griffin 's 1 - year - old child, but often behaves in adult ways such as speaking in an upper - class British accent. He is a child genius who frequently aspired to murder his mother Lois and take over the world but has since mellowed out considerably. Stewie built a time machine with which he and Brian have traveled through time. He turned 1 year old in "Chitty Chitty Death Bang, '' and has not aged past one year since. As a fact in "Road to Rupert, '' he says he is a year old.
what is the babys name in family guy
Stewart Gilligan "Stewie '' Griffin