One and a half year old Abhinav, son of Bishanpura resident Alok, has been missing since September 26, they said.
He was playing outside his house when he had gone missing. A missing person report was lodged in the case on September 29.
No ransom call has been received yet.
"Besides the Crime Branch team, three other teams have been formed to search the missing boy," said Deputy Superintendent of Police Vishwajit Srivastava.
He appealed to the public to post the photo of the missing boy on Facebook accounts and inform police if they get any clue about him.
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Raunak went missing from Sector 71 on September 15.
His father Guddu Singh is a worker at an export company, while the mother works as a house assistant.
Raunak is a student of Class 1. He had left home for school on the fateful day, but did not return, police said.
A missing person report was lodged in this regard at the Sector 58 police station.
"Raunak's photo has been flashed to all police stations and a team is searching for the boy. Till today, he is untraceable," said Srivastava.