Lisette Bamenga's lawyer blamed the deaths on postpartum depression. Investigators said Bamenga acted in a jealous rage after learning that her boyfriend, a former NYPD officer, had fathered a child with another woman.
Bamenga was convicted Friday at a non-jury trial.
She drowned 4-month-old Violet and 4-year-old Trevor in the bathtub after putting windshield wiper fluid in their grape juice in July 2012. She also turned on the apartment's stove gas.
Rescuers responding to a gas leak report found Bamenga with her wrists slit and the children lying motionless in the kitchen.
"The killing of these young children is a horrendous tragedy," District Attorney Darcel Clark said. "And their mother has been held accountable for her actions."
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Bamenga faces five to 25 years in prison on each count when she is sentenced on April 25.