<P> After 18 months of trying to conceive, the two attend a fertility clinic, where it is discovered that Trudy has fertility problems . Trudy and her parents pressure Pete to look into adoption . Pete is at first uncomfortable with the idea but agrees to think about it, and mentions this to his brother . Bud tells their mother, who disapproves completely, stating that people of Pete's social status should not be picking from "discards". When Pete finds out that Trudy has put their name on a list to meet with a prominent local adoption agency, he shouts at her, throws the dinner she cooked off their balcony, and declares that they are absolutely not going to adopt . </P> <P> This leads to a rift in the marriage . Trudy decides to stay at her parents' house during the Cuban Missile Crisis, and Pete refuses to go with her, stating that if he is going to die, he wants to die in Manhattan . </P> <P> Pete and his mother are unaware that Pete has already fathered a child with his co-worker, Peggy Olson (portrayed by Elisabeth Moss). Pete initially met Peggy on her first day as Don Draper's new secretary, in March 1960 . A lower middle class Catholic from Brooklyn, Peggy tells Pete that she has just graduated from Miss Deaver's Secretarial School . Pete makes rude comments about her dowdy appearance, for which Draper scolds him . Later that night, however, after his bachelor party, Pete shows up at Peggy's apartment drunk . Despite his offensive remarks earlier that day, the two sleep together . Months later, Peggy and Pete again have a sexual encounter on Pete's office couch, early in the morning before the other employees arrive . Though Peggy begins to arrive early for work regularly, the two have no further sexual liaisons . During the Season 1 finale, it is revealed that Peggy--who has put on a considerable amount of weight over the course of the season--is pregnant with Pete's child . She gives birth to a boy . </P> <P> Early in Season 2, Peter meets Susie (portrayed by Sarah Wright) after a casting call for Playtex, and they talk in the elevator . Much to Pete's surprise, she lives with her mother, but that doesn't stop them from sleeping together . During the Season 2 finale, when everyone in the office has left for the day, Pete asks Peggy to come sit down with him . Pete tells Peggy he thinks she is "perfect", and then confesses that he is in love with her and wishes he had married her . This declaration prompts Peggy to finally admit that she had his baby and gave it up for adoption two years before . After Peggy reveals this, Pete sits in shock . Pete is last seen sitting alone in his dark office, holding a rifle on his lap . It is the same rifle he bought on store credit in Season 1, when he returned a ceramic chip - and - dip he and Trudy received as a wedding gift . </P>

When does pete find out about peggy baby