In "Bridget Jones's Baby," the paternity of Bridget's baby is a central plot point. The possible fathers are Mark Darcy, played by Colin Firth, and Jack Qwant, played by Patrick Dempsey. Throughout the film, Bridget navigates her relationships with both men, leading to comedic and heartfelt moments. Ultimately, it is revealed that Mark Darcy is the father of Bridget's baby, solidifying their relationship and providing a satisfying conclusion to Bridget's journey.

Hugh Grant does not appear in "Bridget Jones's Baby" because his character, Daniel Cleaver, was written out of the sequel. The film's storyline focuses on Bridget's life as she navigates new relationships and motherhood, and the creators decided to shift away from Daniel's character, who was prominent in the earlier films. Grant himself stated that he was not particularly interested in reprising his role, allowing the film to explore new dynamics and characters, including Bridget's relationships with Mark Darcy, played by Colin Firth.

Yes, Renée Zellweger did gain weight for her role as Bridget Jones in "Bridget Jones's Baby." She reprised her iconic character from the previous films, and to authentically portray Bridget's journey, she adjusted her weight to match the character's description. Zellweger has previously stated that she takes her role preparation seriously, and gaining weight was part of her commitment to embodying Bridget's experiences and challenges.

In "Bridget Jones's Baby," the film concludes with Bridget successfully navigating her life as a single mother to her baby, whom she names William. The story resolves with Bridget finding happiness in her personal life, ultimately reuniting with Mark Darcy, played by Colin Firth. After a series of comedic and heartfelt moments, Bridget realizes her feelings for Mark, leading to a romantic reconnection. The film ends on a hopeful note, emphasizing themes of love, friendship, and family, while leaving the audience with a sense of joy for Bridget's new beginnings.