A woman working at Mother Teresa’s Missionaries of Charity in the eastern Indian state of Jharkhand has been arrested for allegedly selling a 14-day-old baby.
Two other women employees from the centre have been detained and are being questioned about other possible cases.
Police took action after the state’s Child Welfare Committee (CWC) registered a complaint.
The charity has not responded to BBC requests for comment.
“We have found out that some other babies have also been illegally sold from the centre,” a police official told BBC Hindi’s Niraj Sinha. “We have obtained the names of the mothers of these babies and are further investigating.”
Police also recovered 140,000 rupees ($2,150; £1,625) from the centre, which is located in Jharkhand’s capital, Ranchi.
Nobel-laureate Mother Teresa, who died in 1997, founded the Missionaries of Charity in 1950.
The sisterhood has more than 3,000 nuns worldwide. She set up hospices, soup kitchens, schools, leper colonies and homes for abandoned children. The Missionaries of Charity also runs centres for unmarried pregnant women but no longer arranges adoptions.