A three-month-old baby died, and the child's mother was seriously hurt after they were struck in Brooklyn Saturday night when two cars, one of which was going the wrong way, collided.

It happened just after 6 p.m. at the intersection of Gates and Vanderbilt Avenues in Clinton Hill.

A 36-year-old man, who was also on the street, was injured and rushed to the hospital as well. 

Police say a gray Honda Civic driving against traffic collided with black Honda Civic — leading to three pedestrians being hit. It's unclear which of the two vehicles hit the people. 

The NYPD says a 28-year-old male was taken into custody. It's still not clear what role he may have played. No charges have been filed as of this writing. 

People walking in the area were heartbroken.

“There’s something about this happening to a child," said Lieba Swartz-Brownstein. "I feel like I stopped in my tracks. It’s just so sad, so sad."

Louis Romano saw the damage on his way to work.

“I just looked down the block and I see the car all smashed up at the corner,” Romano said.

Police said the 49-year-old woman driving the black Honda Civic was also injured and listed in stable condition at New York-Presbyterian Brooklyn Methodist Hospital. 

At a Monday morning news conference, Mayor Bill de Blasio called on the state legislature to pass the Crash Victims Rights and Safety Act, a package of eight bills that would lower speed limits, add more speed cameras and clarify rules on prosecuting reckless driving. 

"Our laws in this state are still too lax when it comes to reckless drivers," de Blasio said. "There's a chance to fix that now."

De Blasio said that a city law that requires reckless drivers to take a driving course or face losing their vehicles, which was passed by the City Council in Feburary 2020, has recently gone into effect, with drivers starting to take the classes. 

"I think when people start to see that you could lose your vehicle, period, if you are reckless, it's going to make a very big impact," de Blasio said.