While Rosalin Malik died on the way to hospital, her two year-old son Dibyanshu is battling for his life at SCB Medical College and Hospital in Cuttack, the police said.
The incident took place last night at Korabandi village in Jajpur district following a quarrel between the woman and her husband Deepak over some trivial issue.
When Deepak went out following the quarrel, the woman gave pesticide to her son and then she herself consumed it, police said.
On hearing cries of the kid, the woman's 8-year-old son, who was studying in another room of the house, found both mother and brother lying on the floor with foam coming out from their mouths, they said.
While the woman was declared brought dead at the hospital, her son was in a critical condition. He was shifted to SCB Medical College and Hospital in Cuttack where his condition was stated to be critical, they added.