The child was a girl between the ages of 1 and 2; the other victims were a male apparently in his late teens, a man apparently in his 50s, and a man apparently in his late 20s, according to The New York Times.
A relative found their bodies around 5 a.m. at a high-rise complex, the Riverdale Osborne Towers.
Brownsville has long been one of New York City's most violent neighborhoods. Like other parts of the city, it has experienced a steep decline in crime in recent years. It's still one of the poorest parts of Brooklyn.
Young people in the US walked out of class Wednesday to demand action on gun violence in what activists hoped would be the biggest demonstration of student activism yet in response to last month's massacre in Florida.
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