Police say Dominic Greene from Wilmington was found unresponsive at the Hotel Pennsylvania around 1 a.m. Saturday morning.
He was taken to a hospital where he later died.
An autopsy will be performed to determine the cause of death.
Police say the 24-year-old and 26-year-old women are also from Delaware but neither is the child's mother.
Delaware baby found dead in Midtown Manhattan hotel; 2 women in custody
One was his step-sister, and the other is that woman's fiancee.
Responding officers say both women were impaired by either drugs or alcohol when they arrived at the scene.
The women were released Sunday.
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