Mathias is Nana's ex-boyfriend, and his sperm sample is at the center of the series' inciting incident. Initially unaware of what Nana has done, he re-enters her orbit and becomes entangled in a situation neither of them anticipated. His presence forces both characters to confront the unresolved history between them.
As the truth slowly comes into focus, Mathias must reckon with the unusual circumstances of impending fatherhood and what it means for his relationship with Nana. The show treats his reactions with nuance, balancing hurt, confusion, and the pull of old feelings rather than reducing him to a simple obstacle.
Over the course of the story, Mathias's role evolves from unsuspecting ex to a key figure Nana cannot avoid. His arc raises questions about consent, communication, and second chances, and his dynamic with Nana remains one of the emotional engines of the show as it continues into a second season.
Mathias is one of the central figures in Baby Fever, a comedy/romance/drama series that aired on Netflix from 2022–present. Within the narrative of Baby Fever, Mathias serves as a pivotal character whose decisions and relationships drive key story arcs throughout 1,2. The character's journey has been central to many of the show's most memorable and discussed moments.
Portrayed by Simon Sears, Mathias has become one of the most recognizable characters in modern television. Simon Sears's performance brings nuance and depth to the role, creating a character that resonates with audiences on both intellectual and emotional levels. The casting of Simon Sears has been widely praised by both critics and fans as essential to the character's impact and the show's success.
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? Frequently Asked Questions
Mathias is played by Danish actor Simon Sears.
Mathias is Nana's ex-boyfriend, and it is his sperm sample that she uses, making him the biological father at the center of her secret.
