"Baby Not On Board". Stewie is left at home when the Griffins go traveling and he looks in Chris's room and finds the Hustler Magazine.
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Season 8 | Episode 13: "Go Stewie Go"
season 2, episode 3 "da boom" where they all service Y2k and head to the twinkie factory. stewie is a squid in that episode.
Stew-Roids
The evil Stewie clone does it in The Hand That Rocks the Cradle
All of the "Road to" episodes are primarily Stewie and Brian centered episodes, also of the episode titled Brian and Stewie