An unresponsive 18-month-old baby girl who was revived by a trio of Riverhead police officers Sunday night is on the mend, cops said Monday.

“The baby was doing fine today and was released from the hospital,” said Riverhead Sgt. Jill Kubetz. “We’re just very happy and proud that we could have been there in a timely manner to help. And the officers did an outstanding job.”

Police received a 911 call at 6:34 p.m. Sunday reporting an unresponsive baby who “did not have a pulse and was not breathing,” police said.

The baby and her mother were in front of a Subway sandwich shop on Route 25A in Wading River when Officers Brandon Heller, Dan Hogan and Patrick Loszewski responded to the call, said Kubetz.

Hogan began chest compressions and just as the officers “were about to administer breath to the baby, the baby started breathing,” said Kubetz.

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The baby was transported by the Wading River Fire Department to Peconic Bay Medical Center. She was released from the hospital Sunday night.

Police would not release the names of the baby or the mother, but said they are Suffolk residents. The cause of the baby’s medical distress was not available, police said.