The arrested doctor was part of the child trafficking racket in Kolkata.
One more doctor and a woman were arrested by the CID for their alleged involvement in the child trafficking racket busted from Baduria in North 24 district, a senior CID official said.
Tapan Biswas associated with the Baduria nursing home, the second doctor arrested in this case, was held late last night from one of his relative's place at Memari in Burdwan district where he was hiding.
Whereas Basanti Chakraborty, linked to the old age home for mentally challenged persons in Thakurpukur from where 10 babies were rescued, was arrested from a hideout close to her home this morning, the official said.
The latest arrests have taken the total number of persons held in connection case to 18.
Doctor Santosh Kumar Samanta, attached with College Street's Sri Krishna nursing home in the city, was the first doctor arrested in the case.
"We had been in search of Biswas since the racket was busted on November 21. He has been actively involved with these people in the racket. He used to misdirect child-expecting couples coming to the Baduria nursing home. And when a baby was delivered, the doctor used to tell the family members that the mother has delivered a dead baby," the official said.
Mr Biswas and Basanti Chakraborty were brought to CID headquarters at Bhawani Bhawan in Kolkata and grilled for long hours, he added.
Meanwhile, the CID was continuing its raids at several nursing homes in various districts of the state in connection with the case.
"Raids will continue until we reach the deepest root of this racket," he said.
The CID has also exhumed remains of two infants from the compound of Sujit Memorial Trust at Machlandapur in Habra.