The victim was among several girls brought to Delhi by her maternal uncle.
He had handed over his son to an ASHA worker, who had given Rs 700 for purchasing medicine for his wife and 50 kg rice.
The children were handed over to their guardians after medical check up by Child Welfare Committee (CWC).
The girls had claimed to be aged between 18 to 22, but the NGO had told the CWC that they were minors.
The child was rushed to Civil hospital in Gurgaon and was admitted to the neonatal intensive care unit. She is stable, doctors said.
Announced with much fanfare in July, the unit is still to get basic infrastructure and manpower.
The couple who allegedly bought the infant were detained too.
Ramaswamy is still in the ICU along with his daughter, police to record his statement.
The woman’s medical examination was done only after a plea was filed by the investigation officer of the case.
A 15-year-old girl rescued from a prostitution racket has been sent to the children’s home in Dongri, from where she fled two months ago.
The matter came to light after a Child Welfare Committee team visited the shelter home in 2010 and found that the children were living in inhuman conditions.
Family forced to relocate,five of the six accused arrested in the incident that took place in October
The department,which has 1,200 homes at present,had earlier cancelled licences of nearly 192 institutes that were not abiding by rules.
The police said their intervention would create a law-and-order situation,YUVA member.
The child welfare committee has taken custody of the girl,Neelam.