A four-month-old boy died at Hyderabad airport yesterday after he developed breathing problem midair in a Patna-bound flight. The baby was travelling with his parents from Bengaluru in an IndiGo flight when he developed breathing problem, Police said.The airline said the crew of the flight 6E 897 decided to divert it to Hyderabad and requested for an ambulance and a doctor at the airport.On landing, the boy was rushed to a private hospital where the doctors declared him brought dead, the police said.The police registered a case under Section 174 of the CrPC.Sources at the airport told that the flight was diverted to the Hyderabad Airport at around 7.30 am."An IndiGo flight 6E 897 operating from Bangalore to Patna was diverted to Hyderabad due to a medical case this morning," the airline said in a statement."The crew along with a doctor on-board attended to an infant. After landing, the infant was immediately rushed to the hospital accompanied by an IndiGo staff member. Unfortunately the infant died," the statement said.The airline expressed its condolences over the infant's death.