Police said officers were patrolling in Gowanus around 5:35 a.m. when the woman hailed them near the Gowanus Houses.
According to police, she was holding her 4-year-old son who was unconscious and unresponsive.
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The officers contacted emergency medical services and attempted to perform CPR.
EMS brought the child to Brooklyn Hospital where he was pronounced dead.
An investigation is underway.
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