A 25-year old woman allegedly killed her three-month old baby boy by setting him on fire before committing self-immolation in the district on Monday, police said.

Thenmozhi immolated herself and the child by using kerosene in a room in her parent's house at Thookanaickken Palayam village this morning. Hearing cries, others in the house rushed and saw the two engulfed in flames. After dousing the flames, they rushed the woman and child to a nearby hospital where doctors declared them brought dead.