The toddler's mother told police yesterday that when she was sleeping, her neighbour Sumit entered her house and took her son away, said AK Singla, Deputy Commissioner of Police (Northeast).
When she raised an alarm, he got scared and fled the spot leaving the baby behind. A case was registered and Sumit was arrested today.
The incident happened in Nand Nagri area.
Police said the man, who is unemployed, is addicted to cannabis and needed money to buy the drug.
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