<P> Season 2 begins 15 months later, on February 14, 1962, with a slim Peggy and no mention of the birth . Her long absence (not shown) is a mystery to Sterling Cooper's employees . One co-worker jokes during a meeting that "Draper knocked her up and she's dropped nine pounds, eight ounces ." Pete has heard through office gossip that Peggy went to a fat farm . </P> <P> It is revealed later in the season, through a series of flashbacks, that Peggy's family has covered up Peggy's sudden disappearance from Sterling Cooper . They tell Don that Peggy is in quarantine with tuberculosis . Don becomes suspicious and seeks her out at the hospital, where he finds her in a terrible mental state and realizes her hospitalization is not due to tuberculosis . It is not clear if he's learned of her pregnancy . He encourages her to forget about the entire thing, advising she should "move forward" and would be surprised at how easy it is to pretend "this" never happened . </P> <P> During this time, Peggy's sister Anita, who has since given birth to her third child, is resentful of Peggy and tells their new young parish priest, Father Gill (Colin Hanks), that Peggy seduced a married man, got pregnant, and was forced to give up their baby . (Later, in "The Suitcase", Peggy reveals that because only Don visited her at the hospital, her family believed he was the father of her child). Throughout Season Two, Father Gill, who is progressive, repeatedly tries to persuade Peggy to take confession, which Peggy consistently declines to do . By the end of the season, she leaves the church . </P> <P> In "The Jet Set," Peggy gets a makeover from copywriter Kurt Smith, who cuts her demure ponytail in favor of a shorter, more modern hairstyle . </P>

When does peggy go back to sterling cooper