The 20-year-old, who was named in the Indian media as 'Sunil', was hunted by cops after the body of a girl, aged three, was discovered in Gurugram.
He was arrested 320 miles away in Magarpur village, Uttar Pradesh, on Tuesday and confessed to nine similar violent attacks, the Times of India reported.
The suspect is alleged to have hung around food stalls where he would lure victims with sweets and chocolates.
He reportedly told police that breaking their legs with a brick before raping them was a "ritual that aroused him".
The toddler's remains were found on November 12 – 300 yards from where she disappeared a day earlier.
A coroner said she had suffered a fractured skull and died from "the head injury with excessive internal bleeding".
Sunil is accused of raping and murdering at least nine pre-adolescent girls in Delhi, Gurugram, Gwalior and Jhansi over a two-year period.
Authorities say he may be one of the worst paedophile serial killers "known to Indian law enforcement agencies".
His first known victim was a four-year-old girl who he was said to have snatched in 2016, before another girl was found in January 2017 with head and leg injuries.
Investigating officer Sumit Kuhar, said he would take his alleged victims to abandoned areas where he'd dump their bodies.
Police say he couldn't be traced because he didn't have a phone or a fixed place to live or work.
Kuhar said: "We are shocked by his confessions as he not only raped and killed three young girls in Gurugaram but four in Delhi, one in Jhansi and another in Gwalior in the last two years.
"He remembers the rapes, connecting them to the bhandaras he had gone to.
"He would target children who came to get ‘prasad’ or free food and were alone."
Kuhar added: "He chose children who were alone and away from their homes."
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