If you're referring to the episode 'He's Too Sexy For His Fat' (UK Season 3/US Season 2), it's because Stewie is gorging on fattening things such as chocolate cake and ice cream to rub in Chris' face the fact he's on a diet. Hope this helps! :/
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"Get big"? The only thing that comes close to that is the cutaway with Stewie's Big & Tall Shop from The Story on Page One
Season: 9 Episode: 16 -- Big Bang Theory
Season 9 Episode 1
"He" ... exactly who is the "He" you speak of ?Brian, Stewie & Mort go into the past in Road to Germany.Peter & Brian go into the past in Meet the Quagmires.Stewie, Brian & Bertram go into the past in The Big Bang Theory.Stewie & Brian go into the past in Back to the Pilot.Stewie travels into the past (& future) in The Untold Story.
Robert "Big Buck" Maffei
Stewie sings in several episodes, "And the Weiner Is", "Ocean's Three and a Half", "Petergeist", "Emission Impossible", "Road to the North Pole", "Road to Rhode Island", a deleted scene from "Lois Kills Stewie", that's all I can think of off hand.