At least 37 people were killed during the chaos that erupted after IEBC declared President Uhuru Kenyatta defeated Opposition chief Raila Odinga on August 8.
A report by Kenya National Commission on Human Rights states this as the figure and says police were to blame for the deaths that occurred in three days.
The report released on Monday says police used excessive force to contain protests in Mathare, Kibera, Dandora, Lucky Summer and Kawangware areas of Nairobi.
It states live bullets and teargas were also used in Manyatta, Kondele and Nyamasaria in Kisumu as police tried to disperse demonstrators.
“The dead included a six-month-old baby who was clobbered by armed security agents while under the care of its mother in Kisumu county,” chairperson Kagwiria Mbogori said.
The baby was identified as Samantha Pendo.
KNCHR attributed other deaths to officer bludgeoning demonstrators using truncheons.
“Dozens more recuperated in hospitals and at home with various degrees of injuries as documented in our report and perhaps some continue to languish in silence.”