According to the Russian officials, the woman was suffering from mental health problems, with an investigator in the court saying the horrific act was unprecedented in the country.
The nanny is now undergoing psychiatric testing to see if she is mentally sound and able to understand the significance of the crime she has committed.
A nanny has been arrested on Monday after she was seen waving a severed child's head around right outside of a Moscow subway station in Russian Federation.
The body of the child was found in a Moscow apartment Monday after the building had been set on fire.
Before the woman was arrested she is said to have been heard shouting "My child was killed...I will blow up everyone...I hate democracy".
Warning: Graphic images. A woman near a Moscow train station is tackled to the ground and taken into custody while holding a human head.
Powers did not recognize the lady but rather said she was born in 1977 and is from Central Asia.
Russian media also reported police searced for explosive devices in and around Oktyabrskoye Pole metro station.
Investigators said they were trying to determine the suspect's motive.
She also told journalists before a hearing that she did not intend to apologize to the child's parents, the TASS news agency reported Wednesday.
Earlier yesterday police discovered the charred remains of a headless child aged three to four in a burned-out apartment not far from the same metro station. A large number of police vehicles were deployed to the scene but didn't immediately intervene amid fears she might be wearing a suicide vest. "She was standing near the metro entrance and caught my attention because she was screaming 'Allahu Akbar.' I saw that she had a bloodied head in her arms, but I thought it was not real".