<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> 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>
when does pete find out about peggy baby
when does pete find out about peggy baby
During the Season 1 finale
During the Season 1 finale