The Hudson County Prosecutor's Office said the discovery was made around 1:15 p.m. under the Tonnelle Avenue Bridge at the end of Van Wagenen Avenue in Jersey City.
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The suitcase was found just off the PATH train tracks, under the footbridge.
The infant is believed to be under 1 year old.
It isn't clear who made the grisly discovery and called police. Investigators swarmed the area and gathered evidence.
"I got very sad because who would do that to a child," Jersey City resident Karen Hernandez said. "Or if it's a newborn baby, we don't know...it's very depressing."
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An autopsy will determine the cause of death.
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