A boy who turned one year old last month died after his mother hacked him in Mataasnakahoy, Batangas.
The incident occurred when child was alone with his mother in their apartment because his father was at work, GMA News reported.
Their relatives and the authorities found the mother in one corner of the house staring into space while the child was already lifeless.
The officials also found the bolo knife used in the crime from the mother.
The police said there is no indication that the mother uses illegal drugs. But she repeatedly claimed that she was extremely angry at the time of the incident.
The mother is facing a charge of parricide.