The incident happened Sunday eveinng while the victim was walking on Halsey Street.
The suspect followed the 39-year-old victim and her infant to the front of 429 Halsey Street where he yelled at her and then ripped a chain off her neck.
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He then took off on a bicycle.
The woman and her son were not injured.
Anyone with information in regard to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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