A young couple decided to sell their third child due to poverty and approached their relative for giving away the child for adoption, police said.
The relative in turn approached a siddha doctor who identified a "childless couple" in Coimbatore district and struck a deal to sell the infant for Rs 1.80 lakh.
The matter came to light after the Village Health staff at Meensuruti Primary health centre found that the couple had not turned up for immunisation, went to their house and asked them to bring the baby for vaccination.
As per directions, an enquiry was conducted and it was found that the child had been sold due to poverty.
On a complaint police arrested the couple and others and remanded them to judicial custody today.
The couple's relative was absconding, police said.
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