<P> In season 12 , Abby rekindles her relationship with Luka in the episode `` The Human Shield '' when her attempt to vent her frustration at him turns into a kiss and subsequently sleeping together . Initially , they decide to remain friends , but soon become lovers , noting that they always seem to find their way back to each other . Three weeks into their relationship , it is revealed that Abby is pregnant . Despite clearly wanting another child , his own having perished in Croatia , Luka states that he will support whatever choice she makes , as long as they can still remain together . After a week or so of uncertainty , Abby decides to keep the baby . Luka proposes to Abby while she is pregnant , but Abby is not comfortable with the idea because of her past problems , and later claims she ' does n't need a white dress ' to prove she loves him . Their baby , a son named Joseph ( after Luka 's father ) , or Joe for short ( after Joe Frazier , the boxer whom Abby 's long - disappeared father was a fan of ) is born prematurely by emergency C - section at the beginning of season 13 . Abby has to have an emergency hysterectomy . Joe spends several weeks in the hospital 's NICU , requiring surgery during his stay . Abby and Luka 's relationship becomes strained during this period , but they appear much happier in later episodes , caring for their now healthy baby boy . </P>
<P> In season 12 , Abby rekindles her relationship with Luka in the episode `` The Human Shield '' when her attempt to vent her frustration at him turns into a kiss and subsequently sleeping together . Initially , they decide to remain friends , but soon become lovers , noting that they always seem to find their way back to each other . Three weeks into their relationship , it is revealed that Abby is pregnant . Despite clearly wanting another child , his own having perished in Croatia , Luka states that he will support whatever choice she makes , as long as they can still remain together . After a week or so of uncertainty , Abby decides to keep the baby . Luka proposes to Abby while she is pregnant , but Abby is not comfortable with the idea because of her past problems , and later claims she ' does n't need a white dress ' to prove she loves him . Their baby , a son named Joseph ( after Luka 's father ) , or Joe for short ( after Joe Frazier , the boxer whom Abby 's long - disappeared father was a fan of ) is born prematurely by emergency C - section at the beginning of season 13 . Abby has to have an emergency hysterectomy . Joe spends several weeks in the hospital 's NICU , requiring surgery during his stay . Abby and Luka 's relationship becomes strained during this period , but they appear much happier in later episodes , caring for their now healthy baby boy . </P>
when do abby and luka get back together
when do abby and luka get back together
season 12
season 12