The mother of the infant, born at a hospital in Kulamangalam in the district, decided to sell the baby for money and sought the help of the doctor couple Rajasekharan and Shanthi, said police.
The doctors struck a deal with Chitra Bai, running a home for women in the city. Chitra bought the baby for ₹5 lakh, and planned to sell it for a profit, they said.
Following a tip-off regarding sale of the baby, police and child helpline members under the pretext of buying the infant contacted Chitra.
When Chitra told them to come to Maravankulam near here, a police team reached the spot and rescued the baby and arrested six persons.
Chitra was also arrested, police said. A case has been registered under Anti-Human Trafficking and Child Protection Act against the six, police said.
