A college student from Glen Head killed her baby shortly after giving birth by “applying pressure” to the girl’s mouth, a Nassau County prosecutor said Friday.

Assistant District Attorney Veronica Guariglia choked up in court as she described how Sharon Seudat, 20, allegedly suffocated the healthy, 7-pound, 5-ounce newborn Thursday inside her Walnut Street home.

Police found the dead baby in a plastic garbage bag that had been wrapped in a blanket and placed on the back deck of the home, authorities said.

Seudat, charged with second-degree murder, was ordered held on $1 million bond or $750,000 cash bail at her arraignment in First District Court in Hempstead. She did not enter a plea.

Authorities said Seudat has made verbal admissions of the crime to investigators and gave a videotaped statement to Guariglia.

“My client is very distraught,” said defense attorney Edward Lieberman of Sea Cliff, who requested that Seudat be placed in protective custody while in jail.

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“Obviously, this is a tragedy for everyone involved,” Lieberman told reporters outside the courtroom. “The family . . . now is going to be dealing with the immediate situation.”

Lieberman said he was not aware of a defense attorney being present during the police interrogations.

About 25 members of Seudat’s family were present in court, but declined to comment afterward.

Officers and firefighters responded to a 911 call for medical assistance at Seudat’s home Thursday morning. There, they found her suffering from profuse vaginal bleeding, and rushed her to Glen Cove Hospital.

Sharon Seudat, 20, of Glen Head has been charged with second-degree murder in the death of her newborn baby, Nassau County police said. Seudat gave birth in her bedroom on Thursday, March 31, 2016, and suffocated the newborn girl before leaving her in a trash bag on the back deck, police said. Photo Credit: NCPD

An emergency room doctor determined she had recently given birth, prosecutors said.

“They had repeatedly asked the defendant where the baby was,” Guariglia said at the arraignment. “The defendant repeatedly denied the existence of the baby.”

Seudat, a Nassau Community College student who worked part time at a carwash, hid her pregnancy from her family and the father of her child, police said.

When she went into labor, Seudat’s father was at work, but her brother and mother were at home, police said. Her mother rushed into Seudat’s bedroom on Thursday after hearing screams but was still not sure what was going on, police said. At that point, the baby was already dead, police said.