Yoselyn Ortega was sentenced to the maximum sentence for each of the two counts of first-degree murder, as well as sentenced to 25 years to life to be served consecutively for each of the second-degree murder charges.
Before the sentencing last the word was given to Yoselyn Ortega.
The judge agreed with the defense arguments and sentenced to a life imprisonment without PAROLE.
Yoselyn Ortega had worked for Marina and Kevin Krim for two years when she killed two of their children, 6-year-old Lulu and 2-year-old Leo, on October 25, 2012.
Lulu and Leo's mother Marina Krim came home that day in 2012 and found her daughter and son dead in their bathtub. The two children had been stabbed multiple times with a kitchen knife, reports The New York Times.
When Marina opened the bathroom door, Ortega, who had slit her wrists earlier, stuck a knife into her own throat. "Nessie knows this wish will never come true". I just thought: 'I'm never going to be able to talk to them ever again.
Prosecutors had argued that Ms. Ortega was angry about her workload and schedule and killed the children to spite their mother.
Kevin Krim, the kids father, was off on a business trip at the time of their 2012 killings.
They went on to have two more children, Felix born in 2013 and Linus in 2016.More news: Juventus clinch seventh consecutive Serie A title after Roma draw
The former CNBC executive said he was trying to figure it out and "fumbling around" when a flight attendant asked him to go to the cockpit.
"It's the people of NY who wrapped their arms around us in our darkest moment - they are what make this the greatest city in the world", he said.
She had been working for the Krim family for almost two years when she took the children to a bathroom of their apartment and stabbed them to death in 2012.
"There were blood curdling screams from a woman", Rima Starr, a neighbor, told the New York Times that night, adding that after hearing the screams she saw Marina in the building's lobby, with a towel over her head and Nessie, her surviving child, in her arms. The parents' testimony made jurors weep during the emotional trial.
"You will know a diseased mind when you see it", Valerie Van Leer-Greenberg, Ms. Ortega's lawyer, told jurors at the start of the trial.
During the seven-week trial, jurors grappled with whether Ortega had been too mentally ill to understand what she was doing when she killed the children.
The parents claim Ortega's relatives gave false and misleading information about her background as a nanny.
Ortega had worked for the Krims for some two years before she killed their babies.