Police in Hanoi took two people into custody on Monday for allegedly trafficking newborns, local news website VnExpress reported.
Initial information showed that Dang Quang Hy, 66, and his wife, Nguyen Thi Kim Chi would go to hospitals, and convince young women with unwanted pregnancies to let them adopt their babies.
The married couple would pay each mother between VND3-5 million (US$153.88-256.47) after the latter signed a document agreeing to turn over her baby, police said.
They then gave the babies to Chi's younger sister, Bui Thi Le Thuan, 48, to take care of for VND100,000 ($5.12) per day until they found buyers.
VnExpress quoted police as saying that the ring had trafficked four babies. Each was sold for VND10-12 million ($512.95-615.54).
The fifth, a 25-30 days old girl, was rescued when police raided Thuan's house in Hoan Kiem District following a tip-off from neighbors on November 23. During the raid, authorities placed Thuan and Hy under arrest.
The investigation continues to be underway.