According to the police, the body of the child had stab wounds in the stomach and neck when relatives discovered it.
Neighbours say the 18-year-old woman appeared disturbed before the shocking incident, and it was after failing to see the boy that they raised an alarm.
A neighbour, Margaret Njambi, who said they have never witnessed anything as bizarre as this in the area, called for thorough investigations to unearth the circumstances behind the killing.
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Murang’a East sub-County Police Commander Alexander Muasya said the woman who is in police custody will be taken for a mental assessment.
The body was moved to Murang’a District Mortuary awaiting a postmortem.
After the police are through with investigations, she will be charged with murder, the police boss said.