A 2-year-old boy was found dead inside a Queens home early Monday — and a 2-year-old girl was left clinging to life hours later when she fell from a second-story Brooklyn window, cops said. 

The first tragic toddler was discovered unconscious and unresponsive inside an Ozone Park residence at 107th Avenue and 88th Street around 1:15 a.m., police said. 

He was rushed to Jamaica Hospital Medical Center, where he was pronounced dead. 

The boy’s body showed no visible signs of trauma, and the circumstances of his death remain under investigation, cops said.

In an unrelated tragedy several hours later, a 2-year-old Brooklyn girl was critically hurt when she plunged two floors from a window while her mom used the bathroom, cops said. 

Cops responded to a 911 call from the home on East 2nd Street near Ryder Avenue in Midwood around 8 a.m., authorities said. 

She was discovered on the ground with injuries that pointed to a fall from an “elevated position,” police said. 

She was rushed to Maimonides Medical Center, where she was listed in critical condition. 

No criminality is suspected in the fall, cops said.