Synopsis: Baby Girl follows the story of Sanal Mathew, an attendant at a hospital where a three-day-old baby goes missing. While the police immediately jump into the investigation, they are unable to conduct an extensive combing operation across the city because many officers are deputed for an event scheduled to be attended by the chief minister. During their probe, the police interview Sanal, whose statements lead them to believe that a woman in a burqa kidnapped the child. However, the narrative soon shifts when Sanal himself becomes a suspect, with a growing enigma surrounding him. Moreover, siblings Rithu and Rishi are also drawn into this intricate web of confusion and suspense. What follows is a tale of drama and mystery, focusing on where the child is and how everything falls into place.