The eight-year-old, who had just arrived home from school, called 911 from inside of her Southampton, New York home after her brother stopped breathing.
Her parents don’t speak English so they relied on their little girl.
Police say the second grader calmly recited their address and phone number.
Police were able to arrive at the home in time to save the infant.
“Yes, she is 8 years old, was calm cool and collected on the phone with the 911 dispatcher, it is fantastic,’ Lt. Susan Ralph said.