does callie baby die in season 7 episode 18
No
Plot
 The baby is initially unable to breathe, so with Sloan's support, Robbins steps in and is able to revive her
No, she lives. UNANSWERABLE Yes, Torres suffers severe injuries, which endanger both her life and the life of her unborn child.
Song Beneath the Song Song Beneath the Song
Plot Plot
 The baby is initially unable to breathe, so with Sloan's support, Robbins steps in and is able to revive her.   moments after Robbins proposes marriage. Torres suffers severe injuries, which endanger both her life and the life of her unborn child. 
wiki:5607245
Song Beneath the Song [SEP] Plot
When Torres again goes into cardiac arrest, Montgomery delivers her daughter at twenty-three week's gestation. The baby is initially unable to breathe, so with Sloan's support, Robbins steps in and is able to revive her. Across the operating room, Torres's condition begins to improve. Once the surgery is complete, the doctors deal with their own affairs; Sloan's former partner Lexie Grey (Chyler Leigh) commits to her new relationship with resident Jackson Avery (Jesse Williams); Lexie's sister, Meredith Grey (Ellen Pompeo) confesses that she was jealous of Torres's pregnancy, which prompts her husband Derek Shepherd (Patrick Dempsey) to promise that they will have a child together; Altman tells Yang that she can no longer teach her; Sloan and Robbins bond over their shared parenthood.